This is MK8 style nozzle, it is made from a 360 brass base material and plated with TwinClad XT coating.
If you are working with abrasive Carbon Fiber, Stainless Steel, wood filled or any other metal filled filaments, this will greatly improve the life of your nozzle.
TwinClad XT
TwinClad XT is a composite Nickel coating with a hardness of 60-65HRC and the added benefit of a non-stick additive. TwinClad XT is a nickel composite coating designed for very low friction. It offers one of the lowest coefficients of friction, better than nickel with PTFE co-deposit. This coating is also very hard and abrasion resistant.