Glen Sander Engineering Inc. is the only racing wheel company to CNC cold spin all of their aluminum wheel halves. They are cold formed over a 2 stage mandrel and heat treated twice to get a perfect part. The bead lock rings are all made .from billit material, not formed and welded like other rings. Our 6 pin centers are also CNC machined from billit for maximum weight savings. We only use the highest quality aircraft magnesium castings for our splined centers. All wheel halves come fully polished and lock ring anodized for easy maintenance.