Feature:Material: 316 medical stainless steel with pre-sterile by E.O. Gas, transparent plastic shell.The items are the top-quality needles, meeting professional tattooists' standards.Filling in the colors is as easy as applying it with the top-class needles - either by dipping the running machine into a small pot of color or by filling color into the upper opening of the cartridge. What is more, the single-use material quickly be changed and allows for perfect, uncomplicated and hygienic work.