Single box of 20 Cartridges – 17 Curved Magnum Bug Pin Open  (.30mm Diameter, Extra Long Taper). Helios Red Cartridge Needles are the perfect choice for the professional artist. Helios needles are made with a safety membrane to prevent the back flow of ink into your tube or machine to give you an ultra-smooth feel…

Single box of 20 Cartridges – 27 Curved Magnum Bug Pin Open  (.30mm Diameter, Extra Long Taper). Helios Red Cartridge Needles are the perfect choice for the professional artist. Helios needles are made with a safety membrane to prevent the back flow of ink into your tube or machine to give you an ultra-smooth feel…