Choosing a Dr Pen cartridge is easier when you separate two decisions: device compatibility and tip style. Compatibility tells you whether the cartridge fits your pen. Pin count and nano style tell you how the cartridge contacts the skin.
This guide explains what common pin counts mean, how round nano and square nano differ, and which collection to browse when you are ready to order replacement cartridges.
Start with model compatibility
Do not choose by pin count alone. A 12 pin cartridge for one model may not fit another model. First confirm the device family, then choose the tip style inside that family.
- M8 cartridges for Dr Pen M8 devices
- M8S cartridges for Dr Pen M8S devices
- A6S cartridges for A6S devices
- A9 cartridges for A9 devices
- A20 cartridges for A20 devices
- H6 cartridges for Hydra Pen H6 devices
What pin count means
Pin count is the number of individual contact points in the cartridge tip. Lower counts concentrate contact into a smaller area. Higher counts spread contact across a wider area. Nano tips are different because they are designed for very shallow topical finishing instead of standard microneedling depth.
| Tip type | Best fit | Typical reason to choose it |
|---|---|---|
| 9 to 12 pin | Small or targeted areas | More precise contact and easier control around curves |
| 16 to 18 pin | General face use | Balanced coverage without being as broad as high-density tips |
| 24 to 42 pin | Broader areas | More contact points for faster, more even coverage |
| Round nano | Curves and detail areas | Gentle topical finishing around smaller zones |
| Square nano | Flat areas | Efficient topical finishing across broader zones |
Lower pin counts: 9, 11, and 12 pin
Lower pin counts are useful when you want a smaller contact footprint. They are often chosen for detail work, edges, and targeted areas where a broad cartridge feels difficult to control.
Browse by pin count:
Mid-range pin counts: 16 and 18 pin
16 and 18 pin cartridges sit in the middle. They are common choices when you want reasonable coverage without moving all the way to high-density 36 or 42 pin tips.
Higher pin counts: 24, 36, and 42 pin
Higher pin counts spread contact across a wider area. They can be useful for cheeks, forehead, body zones, or sessions where even coverage matters more than pinpoint precision.
Round nano vs square nano
Nano tips are chosen for topical finishing and a gentle feel. The shape changes how the tip tracks across the skin.
- Round nano: better for curves, detail areas, and smaller zones. See round nano cartridges.
- Square nano: better for broad, flatter areas where straight passes are easier. See square nano cartridges.
Quick recommendations
| If your priority is… | Start with… |
|---|---|
| Detail work and small zones | 9, 11, or 12 pin |
| Balanced face coverage | 16 or 18 pin |
| Broad, even coverage | 24, 36, or 42 pin |
| Gentle topical finishing | Round nano or square nano |
How to choose by treatment area
Different areas need different control. A broad cartridge can feel efficient on cheeks or body areas, but it may be awkward near the nose, mouth, or hairline. A lower pin count can feel slower on large areas, but it gives more control where the surface is curved or narrow.
- Forehead and cheeks: many users start with 16, 18, 24, or 36 pin depending on comfort and device instructions.
- Nose, lip line, and small curves: lower pin counts or round nano tips are easier to control.
- Body areas: higher pin counts can cover more area with fewer passes.
- Gentle finishing: round nano and square nano are the main options to compare.
How to choose by experience level
Beginners should keep the setup simple. Choose the correct model collection first, then choose one or two cartridge styles that match your goal. Buying every pin count at once can make the first session more confusing than it needs to be.
If you are new to replacement cartridges, a practical starter approach is:
- Choose the cartridge family for your device model.
- Add one standard pin option for your main routine.
- Add one nano option if you want gentle topical finishing.
- Use a new sealed cartridge for each session.
Common mistakes to avoid
- Buying by pin count only: 12 pin does not mean universal fit.
- Mixing M8 and M8S: check the exact model name before ordering.
- Ignoring nano shape: round nano and square nano feel different in use.
- Reusing tips: cartridges are consumables. Read the single-use cartridge guide.
- Forcing a poor fit: stop if the cartridge does not click in cleanly.
Before you order
Check three things before buying: the device model, the connector style, and the tip type. If your cartridge does not click in easily, stop and compare it with your previous cartridge. For troubleshooting, use our cartridge fit guide.
If you are choosing between two devices, the M8S vs M8 comparison and A6 vs M8 comparison can help you narrow the right cartridge family.
FAQ
What is the most common Dr Pen cartridge pin count?
There is no single best pin count for every user. 12, 16, 18, 36, and nano options are common because they cover different levels of precision and coverage. Start with your device model and intended area.
Are nano cartridges the same as microneedling pin cartridges?
No. Nano tips are generally used for gentle topical finishing, while standard pin cartridges are chosen for traditional microneedling-style contact. Follow your device instructions and stay within your comfort level.
Should I buy round nano or square nano?
Choose round nano for curves and detail areas. Choose square nano for broader, flatter areas where you want straighter, more even passes.
Can I use a higher pin count to get faster results?
Higher pin count does not automatically mean better results. It changes the contact pattern and coverage. Choose based on device compatibility, area, comfort, and your provider or device instructions.
