The Round Shader cartridges by KWADRON® are equipped with a #12 (0.35mm diameter) needle for achieving detailed shading effects with precision. Key to the design of these cartridges is the inclusion of a membrane, a feature that enhances safety by effectively preventing ink backflow. This innovation in cartridge design offers artists a reliable tool for various shading techniques, with the option of longer and medium tapers to suit different artistic preferences and techniques. The availability of longer and medium tapers allows artists to finely tune their ink dispersion for both subtle gradients and deeper shading effects. The smooth polish on each needle ensures minimal friction during use, facilitating a comfortable experience for both artist and client while reducing skin irritation.