This nozzles kit is compatible with Creality K1 and K1 Max 3D printers, and is suitable for a wide range of materials such as PLA, ABS, PETG, TPU, PP, PC, PLA-CF, PA-CF, PET-CF and more. The package includes four copper alloy nozzles and various hardened steel nozzles in different sizes for precision and flexibility. The nozzles are nickel-plated to ensure an ultra-smooth inner wall with a roughness of Ra < 0.4, which enhances filament fluidity and prevents clogging. The nozzles also feature a seamless junction for a flat surface and intense joints that effectively solve the leakage problem, allowing you to focus on creating your ideas without any distractions.