1APPLICABLE MODEL: This nozzle hot end kit adopt upgraded threaded nozzle structure, removable and separately replaced. Available for Bambu lab A1 or A1 mini 3D printer 2EASY TO REPLACE: This is an upgraded version, upgraded from the original, the original A1 hot end extrusion head does not have replaceable nozzles, the for xirbbo A1 extrusion head has threaded, hardened steel nozzles that can be removed and replaced to reduce running costs, this A1 hot end extrusion head special replaceable nozzles can be replaced 3EXCELLENT MATERIALS: Ni plated brass Ti alloy heating block has good heat resistance, abrasion resistance, erosion resistance and long service life 4HIGH TEMPERATURE PRINTING: Hardened steel nozzle is made of excellent hardened steel material with higher thermal conductivity, higher strength, stronger oxidation resistance and longer service life, which can support high temperature filament 320, and the removable nozzle is easy to replace and save time 5INSULATED SILICONE SOCKET: The silicone socket can prevent the fan from cooling the heat block and help stabilize the temperature, useful and practical 1 xHotend 2 x Wrench