Sander Engineering, Inc. is the only racing wheel company to CNC cold spin all replacement wheels. These splined center wheels are cold formed over a two-stage mandrel and heat treated twice to get a perfect part. Splined centers are cast from the highest quality aircraft magnesium and beadlocks feature an anodized finish. Sander wheels are fully polished front and back for easy maintenance, good looks, and long life. If you want quality circle track wheels, you want Sander Engineering.