BIGWASP (4th Generation) Tattoo Cartridge Needles. Cartridges come with membrane to prevent ink leakage to the tube or machine. Compatible with Most Rotaries/Coiled machine as well as Hawk machines and grips. Comes in Box of 20PCS. Made of 316L surgical stainless steel and medical-grade plastic. E.O. Pre-sterilized and packaged in sterile blister packs. Round Shaders are in yellow back cover. Half texture needles design and adopt pure transparent outer case. Smooth edges eliminate additional trauma.