Wjx cartridges tattoo needles patent design increase ink storage, absorb inks faster, injection average and running smooth for each hitting. This cartridges has thin-walled technology that all sizes needles and tubes same shape. Made by Korean pc medical grade frame. Wjx needles reliable for all-purpose work. One piece needle and plunger overmold allows for maximum stability and control. Ethylene oxide (EO) gas sterilized and individually packaged; single use only. Membrane mechanism prevents ink spitback. The membrane and tip of these needles allow artists to enjoy a more fluid tattooing procedure; Compatible with all rotaries/coiled machine, pen style tattoo machine. 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. Mixed 2000pcs sizes cartridges, please leave message which size you need.