Package: 50pcs mixed tattoo cartridge needles, includes 10pcs each of 1203RL, 1205RL, 1207RL, 1209RL, 1211RL.Anti-backflow: Rubber band loaded cartridges, with plastic membrane so that tattoo ink won't flow back to the tubes.Material: The cartridge needles made of high material PVC and stainless steel, enough healthy and durable to work.Safety: Each needle cartridge is individually packed and sealed, much safer and more convenient.Compatibility: The needle edges are specially designed to catch more ink and light Grey tubes make you enjoy better needle visibility. The cartridge needles are compatible with most tattoo guns.