3GD Series Sport Dimpled and Slotted Vented 1-Piece Rear Brake Rotors (GD7491) by EBC®. Quantity: 2 Per Pack. These replacement rotors feature both slots and drilled dimples to provide the superior level of cooling needed for high performance street driving, trailer towing, 4×4 use, drifting, and short track runs. Anodized finish provides corrosion resistance on non-contact areas. The anodized layer is designed to disappear in the area that the brake pads contact the rotor.