Extreme cartridges 100% E.O Gas Sterilized and individually packaged. Smooth edges eliminate additional trauma. Needles made of 316 medical grade stainless steel. Precision assembly. Quality ensured with meticulous 30-point inspection, including pin alignment and solder distribution. Membrane mechanism prevents ink spitback. Low profile housing & better ink flow & shaped on the inside. Compatible with All types cartridge grips and pen style tattoo machines. Mixed Size: 1007RM 1009RM 1011RM 1203RL 1205RL