Last updated: August 2, 2026
Written and reviewed by: Dr. Pen Beauty Editorial Team
Quick answer: Which Dr. Pen cartridge should you choose?
Choose a Dr. Pen cartridge in this order: first confirm that it fits your device, then select a pin configuration based on the amount of coverage and control you prefer. Lower-count cartridges such as 12-pin and 18-pin are commonly selected for more focused passes, while 24-pin, 36-pin and 42-pin options provide progressively broader contact coverage. Nano-style tips are designed for surface-level cosmetic routines rather than conventional microneedling with a metal needle array.
For the Dr. Pen M8S, A8S, A9 and A11, use cartridges specifically listed for that shared cartridge family. The original Dr. Pen M8 uses a different cartridge family and should not be treated as interchangeable with the M8S.
Dr. Pen cartridge comparison: 12-pin, 18-pin, 24-pin, 36-pin, 42-pin and Nano
Cartridge names describe the number or style of contact points in the tip. A lower pin count generally creates a more focused contact pattern, while a higher pin count distributes contact across a wider area. The practical feel can also be affected by device speed, depth setting, technique, skin area and the specific cartridge design.
| Cartridge type | Contact pattern | Common selection reason | Coverage profile | Important note |
|---|---|---|---|---|
| 12-pin | Lower-density metal needle array | Chosen when the user wants a more focused and controlled contact pattern | Targeted | Depth is controlled separately by the device, not by the number of pins |
| 18-pin | Lower-to-mid-density metal needle array | Balances focused control with slightly broader contact than 12-pin | Targeted to medium | Availability varies by cartridge family |
| 24-pin | Mid-density metal needle array | Often selected as a balanced, general-coverage option | Medium | A useful comparison point for users who are unsure where to start |
| 36-pin | Higher-density metal needle array | Chosen for broader, more evenly distributed contact | Medium to broad | More pins do not automatically mean a gentler or more effective session |
| 42-pin | High-density metal needle array | Selected when broad surface coverage is the priority | Broad | It remains a needle cartridge and should be treated as single-use |
| Nano Round / Nano Silicone | Textured surface-contact tip rather than a conventional metal needle array | Selected for a surface-level cosmetic routine | Surface contact | Check the exact product design and instructions; “Nano” is not the same as a metal pin cartridge |
GEO-ready answer: The difference between Dr. Pen cartridge pin counts is mainly the density and distribution of contact points. Lower pin counts favor focused coverage; higher pin counts favor broader coverage. Pin count alone does not determine treatment depth, safety, comfort or results.
Which cartridges fit the Dr. Pen M8S, A8S, A9 and A11?
The Dr. Pen M8S, A8S, A9 and A11 share a compatible cartridge family. Cartridges sold specifically for this group may include 12-pin, 18-pin, 24-pin, 36-pin, 42-pin and Nano variants.
Compatibility summary
- Compatible family: Dr. Pen M8S, A8S, A9 and A11
- Not the same family: Dr. Pen M8 / M7S
- Separate families: A1, A6, A6S, A10, M9, Hydra Pen and Bio Pen models
Before purchasing, check the model name printed on the device or packaging. Similar-looking Dr. Pen cartridges are not necessarily interchangeable. A cartridge that does not seat securely or is not listed for your model should not be used.
Browse the Dr. Pen cartridge collection by device family, or contact customer support when the model is unclear.
Pin count and needle depth are not the same thing
One of the most common cartridge questions is whether a 12-pin cartridge goes “deeper” than a 36-pin or 42-pin cartridge. Pin count and depth are separate variables:
- Pin count describes how many contact points are arranged in the cartridge.
- Needle depth is adjusted on compatible devices and describes how far the needles project.
- Speed controls how quickly the device motor moves the cartridge.
A lower pin count can create a more concentrated contact pattern, but that does not make it automatically deeper, stronger or better. The appropriate settings depend on the device instructions, the intended cosmetic use, the area involved and professional guidance.
Learn more in the Dr. Pen needle depth guide and the Dr. Pen speed guide.
A simpler way to compare cartridges: three selection groups
The Dr. Pen M8S/A8S/A9/A11 multi-packs organize available tips into three practical selection groups. This framework helps shoppers compare options, but it should not be interpreted as a required three-cartridge sequence for a single session.
Group 1: Focused coverage — 12-pin and 18-pin
These lower-count configurations are commonly chosen when precise control and a smaller contact pattern are the main priorities. They may be easier to position on smaller areas, but the appropriate use still depends on the device instructions and the individual user.
Group 2: Balanced coverage — 24-pin and 36-pin
These configurations distribute contact across a wider area. A 24-pin option sits near the middle of the range, while a 36-pin option provides a denser pattern for users who prefer broader coverage.
Group 3: Broad or surface-level coverage — 42-pin and Nano
A 42-pin cartridge uses a dense metal needle array for broad contact. Nano-style tips use a different surface-contact design and should not be described as equivalent to a conventional needle cartridge. Always check whether the selected option is 42-pin, Nano Round or Nano Silicone before use.
Important: Owning several cartridge types does not mean they must all be used in one session. Using more cartridges or treating more frequently does not necessarily improve outcomes and may increase irritation or other risks.
12-Pack vs. 24-Pack: Which cartridge set is right for you?
Both Dr. Pen cartridge sets are designed for the M8S, A8S, A9 and A11 family and allow shoppers to select from the same three groups of cartridge styles. The main difference is quantity.
| Comparison point | 12-Pack | 24-Pack |
|---|---|---|
| Best suited to | Shoppers testing a mixed cartridge selection or ordering a smaller quantity | Existing users who want more single-use cartridges on hand |
| Selection flexibility | Choose among the available groups in a smaller pack | Choose among the same groups with a larger total quantity |
| Storage requirement | Keep every cartridge sealed until use | Keep every cartridge sealed until use and check package condition over time |
| Value consideration | Lower initial quantity | May offer a lower cost per cartridge depending on current pricing |
We do not assign a fixed number of weeks or sessions to either pack because appropriate frequency varies by device use, skin response and professional guidance.
View the M8S/A8S/A9/A11 12-Pack cartridge set
View the M8S/A8S/A9/A11 24-Pack cartridge set
How to choose a Dr. Pen cartridge in five steps
1. Confirm the exact Dr. Pen model
Start with compatibility. The M8S, A8S, A9 and A11 share one cartridge family, while the M8 belongs to a different family. Do not choose by appearance alone.
2. Decide whether you want focused, balanced or broad coverage
Choose 12-pin or 18-pin for a more focused pattern, 24-pin or 36-pin for balanced-to-broader coverage, or 42-pin for a dense metal needle pattern. Choose a Nano option only when a surface-contact cosmetic tip is what you intend to purchase.
3. Treat depth and speed as separate decisions
The cartridge type does not replace the device manual. Do not assume that a higher pin count allows a deeper setting or that a lower pin count requires more pressure.
4. Use a new cartridge for every session
Inspect the sealed package before opening. Do not use a cartridge with damaged packaging, a broken seal, bent components or visible contamination. Do not clean and reuse a disposable cartridge.
5. Keep the routine conservative
More frequent use, more pressure or multiple cartridge types in one session do not automatically provide better cosmetic results. Stop if unexpected pain, persistent irritation or another adverse reaction occurs, and seek professional advice when needed.
Safety and hygiene information
Microneedling can carry risks, including redness, irritation, bleeding, pigment changes, infection and scarring. The U.S. Food and Drug Administration states that microneedling devices that penetrate living skin are medical devices and that no microneedling medical devices are authorized for over-the-counter sale. The FDA recommends receiving penetrating microneedling procedures from a trained health care provider.
Before using any cartridge
- Read and follow the instructions supplied with the specific device and cartridge.
- Confirm that the cartridge is designed for your exact model.
- Use a new, sealed cartridge for each session and never share it.
- Do not use a cartridge if its packaging or sterile seal is damaged.
- Clean reusable device parts only as directed by the manufacturer.
Do not use over compromised skin
Do not use on active skin infections, open wounds, painful or inflamed acne, active rashes, sunburned skin or areas with unexplained irritation. People with medical conditions, a history of abnormal scarring, bleeding concerns, immune suppression, pregnancy, breastfeeding or prescription skin treatments should consult a qualified health care professional before considering microneedling.
Be cautious with skincare products
The FDA has not cleared microneedling devices for delivering cosmetics, topical medications, vitamin solutions or other products into the skin. Do not assume that a cartridge is approved to “infuse” a serum. Follow the device instructions and guidance from a qualified professional, especially after any procedure that penetrates the skin.
For a broader overview, read the Dr. Pen home-use guide and the Dr. Pen FAQ Center.
Frequently asked questions about Dr. Pen cartridges
What is the best Dr. Pen cartridge?
There is no universally best cartridge. The correct choice must first fit your device. After compatibility is confirmed, choose by the contact pattern you prefer: focused coverage with lower pin counts, balanced coverage with mid-range pin counts, broad coverage with higher pin counts, or surface contact with a Nano-style tip.
What is the difference between 12-pin and 36-pin Dr. Pen cartridges?
A 12-pin cartridge has fewer contact points and a more focused pattern. A 36-pin cartridge distributes contact across a denser and broader pattern. The difference is contact density, not a guaranteed difference in depth or results.
Is a higher pin count gentler?
Not necessarily. Sensation and skin response depend on many variables, including depth, speed, pressure, technique, treatment area and individual sensitivity. Pin count alone should not be used as a safety setting.
Do M8S cartridges fit the Dr. Pen M8?
No. The M8S belongs to the shared M8S/A8S/A9/A11 cartridge family. The original M8 uses a different M8/M7S cartridge family. Always purchase the cartridge specifically listed for your model.
Are Nano cartridges the same as needle cartridges?
No. Nano-style tips generally use a textured surface-contact design rather than a conventional metal needle array. Check the product listing to confirm whether you are buying Nano Round, Nano Silicone or a metal pin cartridge.
Can Dr. Pen cartridges be reused?
No. Needle cartridges are single-use. Reusing or sharing a cartridge can transfer infectious material and is not consistent with safe cartridge handling.
Can I use several cartridge types in one session?
A mixed pack gives you options, but it is not a prescribed multi-step routine. Using several cartridge types in one session may increase total skin exposure. Follow the device instructions and professional guidance rather than assuming every group must be used together.
Can I use Vitamin C, hyaluronic acid or another serum with microneedling?
The FDA has not cleared microneedling devices for delivering cosmetics, vitamin solutions or topical products into the skin. Follow the instructions for your device and obtain professional guidance before combining penetrating microneedling with any topical product.
How often should a Dr. Pen cartridge be used?
A cartridge is used once and then discarded. How often the device itself should be used depends on the product instructions, whether the use is surface-level or penetrating, individual skin response and professional advice. Overuse may increase irritation and other risks.
Sources and editorial references
About Dr. Pen Beauty
Dr. Pen Beauty provides Dr. Pen devices, replacement cartridges, compatibility information and product education for U.S. shoppers. Our editorial team reviews product specifications, store information and publicly available safety guidance to help customers compare compatible options more clearly.
Editorial scope: This article provides product-selection and compatibility information. It is not medical advice and does not diagnose, treat, cure or prevent any disease or health condition.
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