Single box of 20 Cartridges – 13 Magnum Open  (.35mm Diameter, 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 with just the right…

Single box of 20 Cartridges – 15 Magnum Open  (.35mm Diameter, 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 with just the right…

Single box of 20 Cartridges – 5 Magnum Open  (.35mm Diameter, 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 with just the right…

Single box of 20 Cartridges – 7 Magnum Open  (.35mm Diameter, 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 with just the right…