Compatible Printer: nozzles are for K1/K1 Max 3D printer. Material: MK8 hardened nozzles are made of high-quality hardened steel. The nozzle is not easy to stick filament with high hardness, resistant to wear and tear. 0.4MM hardened steel nozzles work with 1.75mm PLA/ABS/PETG/TPU/Wood filament. High Speed: It's a so the print head heats evenly. The interior of the nozzle is smooth without burry, which not only reduces air resistance and prevents the filament from jamming, but supports high-speed printing. Premium Nozzle Quality: It's made of high-quality brass which ensures more uniform printing, resulting in a better print result. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Copper & Black Material:brass+hardened steel Size:0.4mm Package Contents: 5 * Hardened Nozzles 5 * Brass 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.