[Compatible With Multiple FDM 3D Printers]: This nozzle kit is compatible with K1/K1 Max 3d printers, please confirm your 3D printer model before ordering. [6PCS 3D Printer Extruder Nozzles Kit]: Input diameter is 1.75mm, output diameter is 0.4mm, included 2pcs 0.4mm hardened steel nozzles, 2pcs 0.4mm brass nozzles, 2pcs silicone socks cover. Sufficient quantity and two different materials of hotend nozzles easy to change them in time for quality printing. [High Precision Nozzles]: The nozzle set is made of high precision CNC machining, with better thermal conductivity and high hardness, smooth and burr-free inner wall, low viscosity coefficient, nozzle error less than 0.02mm, chamfered and rounded to reduce the resistance of the diamond angle to the filament, smoother feeding filament, not easy to clog, to provide you with precise and smooth extrusion printings. [High Quality 3D Printer Parts & Accessories]: Made of high-quality hardened steel and brass, which has a large weight, advanced heat treatment process, and better oxidation resistance, which extends the service life of the nozzle. The contact surface is flat, solving the problem of filament leakage and effectively preventing printing head leakage. Stable performance and durability. Compatible with most high-temperature and low-temperature printing filaments on the market. The actual product may have slight color differences or differences, which does not affect use. Colour:Photo Color Material:Metal Package Contents: 2 x 0.4mm hardened steel nozzles 2 x 0.4mm brass nozzles 2 x silicone socks cover 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.