EZ® Revolution Series Cartridge Needles are EZ® latest generation cartridges, EZ® "R" series are the perfect choice for the professional artist,to give the artist an ultra-smooth feel with just the right tension. Safety membrane inside system. Light clear colors tip body - better visibility. Low profile housing & better ink flow & shaped on the inside. Mag curved tip at the end for easier cornering. Exact fit for needle groups every time. Smooth edges eliminate additional trauma. 100% EO Gas Sterilized and individually packaged. Needles made of 304 medical grade stainless steel. Medical grade plastic tips.