Replacement Microneedling Pen Cartridges Compatible with M8S, A8S, A9, A11, Micro needling Derma Roller Use At-Home & Travel (36 P, 12 PCS)

0.24 mm. 12 PCS in a box. Each microneedling cartridge comes individually sealed for cleaner storage. It is easy and safe to use at home or while traveling. | Designed with an anti-backflow structure to help prevent serum backflow during operation, protecting your pen. | 3-snap locking mechanism ensures a snug and stable fit for M8S, A8S, A9, and A11 devices. Simple to install and replace 36 pin cartridges without wobbling. | Only for external cosmetic use. Please check your device model before purchasing these replacements.