Premium Quality - 5PCs high-quality hardened steel K1 nozzle kit, provide high-speed printing up to 600mm/s, for Creality K1/CR-M4/CR-10 SE/Ender 3 V3 KE 3D Printer. Good abrasion resistance, heat resistance, and corrosion resistance.It is convenient for you to replace them in time to achieve high-quality printing. High Speed Printing - The hardened steel has a high thermal conductivity rating of 22W/m.k, high temperature resistance up to 450°C, requires high flow rate for high-speed printing. Premium Performance - The hardened steel is heat resistant up to 450°C, which adopts advanced heat treatment process, and the Mohs scale hardness reaches 7.8, which extends the service life of the high speed printing nozzles. High Precision - Ra