Usage Tips:[Compatible With Multiple FDM 3D Printers]: This nozzle kit is compatible for Anycubic Kobra 2 3d printers, please confirm your 3D printer model before ordering. [10PCS 3D Printer Extruder Nozzles Kit]: Input diameter is 1.75mm, output diameter is 0.4mm, included 5pcs 0.4mm hardened steel nozzles, 5pcs 0.4mm brass nozzles. Sufficient quantity and two different materials of hotend nozzles make it easy for you 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. [ 3D Printer Parts & Accessories]: Made of 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. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Photo Color Material:Brass + Hardened Steel Package Contents: 5pcs 0.4mm hardened steel nozzles 5pcs 0.4mm 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.