RPG Cartridge Tattoo Grips by FK Irons — Considered to be one of the safest cartridge grips in the industry, the Darklab RPG Click grips by FK Irons are the first autoclave-safe, adjustable carrtidge grip. For seamless performance, these high quality cartridge grips are compatible with all FK Irons and Spektra rotary machines that accept all major cartridge systems. The Darklab RPG 2 Disposable Grips provide artists with a single-use option featuring the same streamlined design and durabiliy as the aluiminum grips.