Hero Cartridges - Round Liners (20/Box)Hero Cartridges are designed with a smoother membrane system, thinner profile, stronger 316L Japanese stainless surgical steel and a specialized design to hold more ink than conventional tattoo cartridges. A first of its kind, these cartridge needles will help draw more ink and allow you to pull longer crisp lines, better shading, and color blending. Hero Cartridges are manufactured using a state of the art automation system for extreme consistency