EradiSpeed-PLUS™ rotors are also a direct OEM replacement, however the "plus" indicated rotors that are of a 2-Piece design. An EradiSpeed-PLUS™ hat is CNC machined from billet or forged aluminum and anodized black. The hats and rotors are joined with NAS (National Aerospace Standard) the same hardware used in Indy cars. With a 2-Piece design, EradiSpeed-PLUS™ units provide a welcome reduction in total rotor weight. Features: 2-Piece (aluminum hat and iron disc) rotors provide LITE™* direct replacement for OE applications Also direct replacements Increased mass in the "firepath" Curved vane directional Design Employ an aluminum hat or hub/hat to provide a lower total weight NAS stainless hardware Feature crossdrilled, slotted and zinc coated surfaces. * LITE™ is Baer’s Trademark denotes “Low Inertia-Thermally Efficient” two-piece rotors used in various Baer offerings