Durable material: MK8 extruder nozzle is made of hardened tool steel, which has good wear resistance, heat resistance and corrosion resistance. The sturdy structure makes it durable and suitable for high temperature 3D printing Good performance: This hardened tool steel nozzle has higher toughness and hardness, not only suitable for common 1.75mm 3D printer filaments, but also for printing carbon fiber, glass fiber and other filaments. High precision: The inner wall of the MK8 nozzle is smooth and free of burrs, and the viscosity coefficient is small. The diameter error of the extruder nozzle is less than 0.02 mm, providing you with accurate and smooth extrusion Compatibility: These 3D printer nozzles are compatible with 3D printers such as 3. You will get: 15 MK8 nozzles are included in the package, enough for easy replacement in time, and high-quality printing Material:Hardened steel colour:Black Package Contents: 15 x 0.4mm MK8 hardened steel nozzles Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.