36 pin Micro Cartridges, 20pcs Replacement Cartridges for Ultima A6 Derma Pen Auto Microneedling System, Bayonet TypeDermapen Micro cartridge for Ultima A6The replacement Dermapen cartridges are compatible with the Derma Pen Ultima A6 microneedling Pen. Bayonet SlotPrior to use, verification is essential. This device is equipped with a bayonet slot as opposed to a threaded slot, enabling convenient and efficient attachment and detachment operations. Individually PackagedThe sterile cartridge design ensures safe and hygienic use. Each Dermapen micro cartridge is