This is MK8 style nozzle, it is made from a 360 brass base material and plated with TwinClad XT coating. TwinClad XT is a nickel composite coating designed for very low friction. It offers one of the lowest coefficient of friction, better than nickel with PTFEco-deposit. This coating is also very hard and abrasion resistant.If you areworking with abrasive Carbon Fiber, Stainless Steel, wood filledor any other metal filled filaments, this will greatly improvethe life of your nozzle.