This is RepRap style nozzle, it is made from a A2 Tool Steel, heat treated to 57-62 RC 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. Orifice size available: .4mm, .6mm, .8mm, 1.0mm