Commonly used for packing in color, filling large areas and shading. The needles are configured in two rows (one row "stacked" on another). For example, The configuration for 17M2 would be 9 needles on the bottom row and 8 needles stacked on top row. The width of a 17M2 needles is only 9 needles wide. Our pre-made double stack magnum tattoo needles are made using 316L stainless steel, on the bar, pre-sterilized with EO Gas, indivdiually blister-packaged and ready to use. Each tattoo needles is stamped with sterilization expiration date. All our double stack magnum needles are #12 needles. We offer the followoing sizes: 5M2, 7M2, 9M2, 11M2, 13M2, 15M2 and 17M2.