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. The TwinClad XT coating is also very hard and abrasion-resistant. If you work with abrasive carbon fibers, stainless steel, wood-filled, or other metal-filled filaments, this will significantly improve the lifespan of your nozzle. Compatible with: Ultimaker 3, Ultimaker 5s.