The Round Shader Needle Cartridges with Membrane from WorldWide® Tattoo Supply, also recognized as TCM Supply Corp are crafted with high-grade surgical steel.. With a standard #12 needle gauge/diameter, they are designed for artists who demand precision in their shading work. The cartridges come equipped with a membrane, offering a safeguard against ink spit back, thus preserving the integrity of the artwork and the longevity of the tattoo equipment. A notable advancement in these cartridges is the precision clear tip with a double opening, designed for enhanced visual control and optimal ink flow. This feature, combined with the rigorous quality control process, ensures that each needle cartridge meets the high standards expected by professionals.