Treated with highly-temperatures carburizing and hardening, and have super wear resistance, heat resistance, highly hardness and highly toughness. Two characteristics, long service life, and suitable for most printing materials on market. highly thermally performances, keep the nozzles tip temperature uniform during the printing process, thereby ensuring stable extrusion. Use hardened steeL surfaces coating. It have super hardness and excellent conductivity. Since nozzles typically have very highly thermally property, printing speed can be furthers increased without sacrificing quality. From traditional printing to reinforced materials, nozzles can easily handle long printing periods on any material. Applicable models:for Prusa i3 MK4 3D printer Colour:Black & Silver & White Material:Plastic+Metal Package Contents: 1 * Heating block 1 * Extruder temperature measuring line 1 * Heating rod 6 * screws Only the above package content, other products are not included. Note: Light reflection 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.