Capricorn XS series is made from virgin PTFE. This gives it extremely low friction and has a very high temperature resistance. The XS series is of a high precision needed for a 3D Printer. This product is specially designed to be the heat break liner inside a 1.75mm Hotend with a 2mm inner diameter and 3mm outer diameter. The Capricorn XS Heat breaker liner comes in 300mm lengths, enough for 10 hotends!