Dynarex Fearless Tattoo Cartridges feature a high-quality plastic casing and feature a membrane system that helps prevent ink back flow and contamination. The Fearless Tattoo Cartridge needle groupings have been crafted from surgical stainless steel, clean soldering and have been sharpened to a razor-sharp point, allowing for clean needle penetration to provide the highest possible precision. The cartridge line includes Round Liners, Tight Round Liners, Round Shaders, Magnums and Curved Magnums and has the appropriate size imprinted on the casing for easy identification after being removed from the packaging. 5/20/CS