Matrix PMU Cartridges combine a seamless blend of innovation and PMU industry expertise, ensuring a flawless application every time. It’s the epitome of natural-looking results and precision technology. Crafted with sharp and strong needles, each stroke delivers a direct and quick deposit into the skin, ensuring minimal trauma while achieving flawless outcome. So what makes Matrix PMU & SMP cartridges different? Made to work with all twist in style cartridge grips and machines 20 needles per box – each needle is individually sealed and sterilized Medical grade plastic and stainless steel used for superior quality Round Liner, Round Shader and Soft eddge Magnum Most sizes available in both #10 gauge (0.30mm) and #12 (0.35mm) – some sizes available in smaller bugpins - #4 (0.18mm), #6 (0.22mm), and #8 (0.25mm)