The K1 nozzle kit is made of high-quality materials for longer service life and high-speed printing to 600 mm/s. Compatible with K1, K1 MAX, - 3d printers. The copper alloy 3D printer nozzle has a high thermal conductivity of 330W/m.k, which ensures uniform heating, high flow rate, and is suitable for high-speed printing. Nickel-plated surface, roughness Ra Less than 0.4, reduces wire adhesion and ensures smooth extrusion of materials, such as PLA, ABS, PETG, TPE, TPU, PC, high-temperature wire , PEKK, PEI, power supply, PPSU, etc. The hardened steel nozzle is corrosion and abrasion resistant and perfect for use with composite filaments. Copper alloy nozzles: 0.4mm x 2 pcs, 0.6mm x 1 pcs, 0.8mm x 1 pcs Hardened steel nozzles: 0.4mm x 2 pcs, 0.6mm x 1 pcs, 0.8mm x 1 pcs Color: Silver & Black Material: Chromium zirconium copper+hard steel Package Contents: 4 x Hardened Steel Nozzle 4 x Copper Alloy Extruder Nozzles 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.