Cartridge Needle Box contains 20 Individually Blister Packed Needles which are EO sterilized. These cartridge Needles made of 316L surgical stainless steel and professional-grade plastic. Cartridge Needles has Silicone Membrane that prevent fluid/liquids from flowing back into the device. Cartridge Needles come with long taper and pin diameter of 0.35mm. FYT Cartridge Needles compatible with all the standard tattoo machines.