Wjx cartridges tattoo needles patent design increase ink storage, absorb inks faster, injection average, and running smoothly for each hitting. This cartridge has thin-walled technology that all sizes needles and tubes same shape. Made by Korean pc medical-grade frame. Wjx needles are reliable for all-purpose work. One-piece needle and plunger over-mold allow for maximum stability and control. Ethylene oxide (EO) gas sterilized and individually packaged; single-use only. The membrane mechanism prevents ink spit back. The membrane and tip of these needles allow artists to enjoy a more fluid tattooing procedure; Compatible with all rotaries/coiled machines, pen-style tattoo machines. High-quality silicone to keep the needle elastic. Cartridges body with transparent that allows you to see all of your inner and quantity of ink that goes into the nozzle, Unexpected surprise. Mix Size 50boxes, please leave a message which size you need. Please send the required model to the mailbox: email@example.com, or remark when placing the order. Otherwise, it will be sent randomly by default.