3GD Series Sport Dimpled and Slotted Vented 1-Piece Rear Brake Rotors (GD7243) 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, 4x4 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.