Diamond Slot™ Dimpled and Slotted Vented 1-Piece Front Brake Rotors (D55-091-BP) by SP Performance®. Quantity: 2 Per Pack. You want your brakes to look like a million, but need them to stop on a dime. SP Performance Diamond slot rotors deliver. They stop on a dime and add a little bling-bling to your ride. Designed for strength and better stopping power with an exclusive new look, Diamond Slot Rotors not only look cool, they also stop as good as they look. This slotted design was created to maximize the out-gassing while maintaining the structural integrity of the rotor. The series of slots and diamond "wipes" the surface of the pad clean, and vent expanding gases which cause brake fade at higher temperatures. The slots also greatly improve wet weather braking by preventing hydroplaning between the pad and rotor.