<b>BIGWASP 4th Generation Premium Tattoo Needle Cartridges are disposable single-use, tattoo needle cartridges that allow tattoo artists to set up needles and switch needle configuration very quickly during tattooing process.</b></br></br> Compatible with all standard cartridge grips & machines.</br></br> No allen keys required, sold in a box of 20 pieces.</br></br> <b>Cartridge needles diameter:</b></br></br> #10 Bugpin 0.3mm </br></br> #12 Regular 0.35mm