Compatible with all rotary and pen style tattoo machines, as well as Hawk machines and grips. Needles perfectly matches with shell which makes provides superior ink flow and great consistency. High quality custom rebound safety membrane prevents back flow of ink and bodily fluids. 304 steel allows needles to stay sharper longer, allowing accurate and gentle puncturing. Lead free. 100% E.O Gas Sterilized and individually packaged. Single use only. Box of 20 needles.