This is MK8 style nozzle, 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 then nickel with PTFE codeposit. This coating is also very hard and abrasion resistant. If you are working with abrasive filaments like Carbon Fibre, Aluminates or metal, this will greatly improve the life of your nozzle.