HRK Tattoo Cartridges are professional sterile tattoo cartridge needles listed in 20-piece boxes. The collection presents Round Liner (RL), Round Shader (RS), Magnum (M1), and Round Magnum (RM) configurations, and each product title references a membrane system. The range is organized for artists who need different groupings for lining, shading, magnum filling, or round magnum work. Because the page identifies the cartridges as professional and sterile, it is positioned for tattoo studio supply and regular tattoo work. Review the individual product page for the displayed needle size, available variant, and pack details before purchase. Keeping the HRK series on one page makes it easier to compare the four configurations without confusing them with HRK Gen 2, Gen 4, or Nova products. Use the machine and cartridge compatibility information shown on the selected listing when preparing an order.