These Weld Racing RT-S forged aluminum black wheels feature 3-piece forgings that are assembled by welding, for application flexibility. They are manufactured using primary forging-grade aluminum alloys to create maximum strength and durability. Weld Racing RT-S forged aluminum black wheels are available in 15 in. to 18 in. diameters and are tested with F.E.A. and in-house destructive testing to ensure safety.