EradiSpeed+ Plus rotors are still a direct OEM replacement, but the "plus" indicated rotors that are of a two-piece design, An EradiSpeed+ hat is CNC machined from billet or forged aluminum and anodized black. The hats and rotors are joined by the same hardware use in Indy cars. With a two-piece design, EradiSpeed+ units provide a welcome reduction in total rotor weight.