Buyers notice 1) These products are Tattoo Needle Cartridges. 2) Please feel free to contact us if you need wholesale prices. Proudct Description: 1) Allows tattoo artists to set up needles and switch needle configuration very quickly during tattooing process. 2) Compatible with All Rotaries/Coiled machine as well as Hawk machines & cartridge grips. No Allen keys required. 3) Ready To Use - Comes in Box of 20Pcs. 4) Made of 316L surgical stainless steel and medical-grade plastic. E.O. sterilized and packaged in blister pack. 5) Rubber band loaded cartridges, with plastic membrane so that tattoo ink won't flow back to the tubes, 100% Safety.