MO Cartridge Needles (Round Magnum)1) MO Tattoo Cartridges, Made and assembled in the most hygienic condition. 2) Compatible with All types size cartridge grips & machines. 3) Made of premium needles, Safety membrane inside system. 4) A unique and industry first feature, the cartridge finger ledge gives you the perfect place to rest your finger while working. 5) E. O. Pre sterilized and packaged in sterile blister packs. 6) New style perfect plastic design hold ink well and makes ink