Needles Type : 3RL 5RL 7RL 9RL 11RL 10 each size, Needle Diameter : #12 (0.35mm), AURORA cartridge needles compatible with all standard cartridge grips & machines, Safety membrane inside cartridges system, that stops ink from passing through to the Tube and Machine, Clear tip get better visibility tattooing , Ethylene Oxide Gas Sterilized and Individually Packaged, single use only, Made of 316L surgical stainless steel and medical-grade plastic, Box of 20 pcs needles.