· ELITE Needle Cartridge are manufactured with the highest quality control in the industry. · 316L Stainless Steel Needles - Medical Plastic Cartridge Tips · Big range of configurations -- 95 needle configurations meets all artworks requirement. · Cartridges are sealed with Membrane. · Shorten the cartridge tips for more precise artworks, and artists can hold the grips more comfortable. · Needles are perfectly fit on tips for better stabilization, minimize the vibration of the needles. · Color Caps - Easy to find the right cartridges. · The cartridges made and assembled in the most hygienic condition · 100% sterilized by E.O. Gas. -- you can send some to Lab to verify at any time at any lot ! · Sold by box of 20PCS