This is a brass-coated, wear-resistant nozzle for the Ultimaker 3 Print Core AA. The nozzle is made from a 360 brass base material and features a TwinClad XT coating. TwinClad XT is a nickel composite coating designed for very low friction. It offers one of the lowest coefficients of friction, better than nickel with PTFE co-deposition. Additionally, the TwinClad XT coating is very hard and abrasion-resistant. If you are working with abrasive carbon fibers, stainless steel, wood-filled, or other metal-filled filaments, this will significantly extend the lifespan of your nozzle. Compatible with: Ultimaker 3, Ultimaker 5s.