The 22.5” simulator set is made of high quality 304-grade stainless steel. All surfaces are carefully mirror-polished for a shinier finish prior to leaving the factory. The item is one of the best investments and upgrades for your truck. Our package comes with a one-year manufacturer warranty. This model and the included mounting pieces are designed to fit a Hub-Pilot wheel system. Mounting pieces for stud-pilot wheels must be purchased separately depending on your application.