This is Micro Swiss MK10 All Metal Hotend ONLY style nozzle, it will ONLY fit our MK10 All Metal Hotend Kit. This nozzle has completely different internal dimensions to work with our Micro Swiss thermal barrier tube. It is made from a A2 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.