The UM3 extruder nozzles have undergone extensive long-term testing to effectively address clogging and material shortage issues. They feature low thermal conductivity, corrosion resistance, and abrasion resistance. Additionally, these 3D printer extruder nozzles boast impressive robustness and hardness, as well as high temperature resistance. The inner wall of the UM3 nozzles is smooth and burr-free, their viscosity coefficient is low, and the nozzle diameter error is less than 0.02mm, ensuring precise and consistent extrusion. This set of four nozzles facilitates quick replacement and high-quality printing. Specifications: Material: Brass; Nozzle Diameter: 0.4mm; Color: Gold; Nozzle Length: 3mm / 0.11 inches; Type: For Ultimaker 3 UM3 Brass Nozzles; Quantity: 4 pieces. Note: When disassembling, heat to over 200 degrees Celsius before proceeding. Disassembly is required! Due to lighting effects and shooting angles, there may be some tolerances in the product; thank you for your understanding. Please allow a 0-1cm error due to manual measurement. The package includes a set of 4 UM3 nozzles.