Product - Round Shaders Needle Cartridges with Membrane Needle Size - Standard #12 Needle Gauge/Diameter Brand - Radical® Sold In - Boxes of 20pcs Sterilized - EO Gas Sterile Compatibility - These cartridges are industry standard and will fit all machines and grips. These cartridges has a membrane to prevents ink spit back. The Radical® Needles are made with high quality steel and high quality soldering. These cartridges has a precision clear grey tip for visual control & perfect ink flow. These needle go through strict quality control to make sure you get a great high quality tattoo needle. Buy them in smaller quantity 1-Box also available.