The RepRap M6 nozzle is made from brass as the base material and is coated with the patented TwinClad XT coating. TwinClad XT is a nickel composite coating designed for very low friction. It offers one of the lowest coefficients of friction, thereby reducing the clogging of the nozzles. Additionally, the coating makes the nozzle very hard and wear-resistant, making it particularly recommended for use with abrasive filaments such as carbon, aluminum, or metal. This nozzle is available for two different filament diameters: 1.75 mm and 3.00 mm.