Bugpin Curved Mags are made with high quality 316L surgical stainless steel needles, and high quality medical grade plastics and silicon. Their medical grade silicon is made of a softer less stiff silicon than other cartridge systems for less resistance on your machine, meaning less wear on your machine. These are designed by artists for artists! .30mm in diameter. 20 needle cartridges per box.

Addictive Ink Cartridge Needles - Bugpin Curved Magnum