Durable material: MK8 extruder nozzles are made of hardened tool steel, good abrasion resistance, heat resistance and corrosion resistance, sturdy construction makes durable to you for long time, suitable for 3D printing at high temperature Good performance: this hardened tool steel nozzle has higher toughness and hardness, not only suitable for common 1.75 mm 3D printer filaments, also can print filaments of carbon fiber, fiberglass, etc. High precision: the inner wall of the MK8 nozzles is and has no burrs, the viscosity coefficient is small, extruder nozzle diameter error less than 0.02 mm, you a accurate and extrusion Compatibility: these 3D printer nozzles compatible with MK8 hotend for 3D printers, such as -2/ -3/ -3 pro/ -5, also compatible with -10 all-metal hotend, Prusa i3, Anet A8, Reprap, etc. What you : package comes with 5 pieces of black MK8 nozzles, the size is 0.4 mm, sufficient to facilitate your replacement, achieving quality printing Colour: black Material: hardened steel Size: : 0.4mm Package Contents: 5 x 3D printer 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.