These are OEM and made of steel but something keeps the spoke portions from rusting like the painted portion does. Maybe there is enough nickel in areas that make it nearly dull stainless. I just don't know. The bigger question is "what media to use in the blaster?" I could buy the painting masks and try to protect those unpainted areas, but the masks are only peel and stick vinyl. It might stand up to soda but I figure sand would destroy it.
