- Excellent materials: heating block made of nickel-plated brass and Ti alloy offers good heat resistance, abrasion resistance, erosion resistance, and long service life. - Easy to replace: improved version of the A1 hot-end. The original A1 had no interchangeable nozzles; the Xirbbo A1 extrusion head uses hardened steel threaded nozzles that can be removed and replaced to reduce operating costs, and allows special interchangeable nozzles to be swapped. - Applicable model: nozzle hot end kit with an improved, removable thread nozzle structure that can be replaced separately. Compatible with A1 or A1 mini 3D printers. - High temperature printing: tempered steel nozzle made of hardened steel with high thermal conductivity, high strength, strong oxidation resistance, and long service life. Supports high temperature filaments up to 320 C. The removable nozzle is easy to replace and saves time.