The original axle slider set for supermoto duty and required by most supermoto tracks (so you don't mess up the track for the go card dudes). All spacers and axle nuts are CNC machined from 6061 aluminum and anodized in your choice of Gold, Silver, Red, Black, Blue and Orange(for KTM). Stainless steel rod is machined in house for a tight fit. The sliders are made from Black Delrin and CNC machined. Everything is made and assembled in our California facility using domestic materials.