FlowForm is a unique casting and forming process that results in a wheel that is similar in strength to that of a forged wheel. The wheel is low pressure cast in aluminum and is rapidly cooled to enhance its elastic strength and durability. The cast wheel is then placed in a special flow forming tool where rollers press against the barrel to pull the rim into its final width and shape. This “stretching” process improves the grain structure of the aluminum making the wheel much stronger and lighter than a standard cast aluminum wheel. HRE Performance wheels not only look great, but feature a durable powder coated finish that is tough enough to stand up against the hazards of everyday driving - including road chips and pitting. This HRE Performance Wheel is completed in a light Fog Gray finish for a subtle appearance that won't distract from its design. This 20x10.5 HRE FlowForm FF01 Wheel fits the rear only of all 2005 to 2014 Mustangs, including the V6, GT, Bullitt, BOSS and Shelby GT500 models. Stagger with a 20x9.5 wheel on the front for an aggressive muscle car stance and improved traction. Source: HRE Wheels