With SP Performance Slotted rotors, you will feel the difference. Its series of slots wipe the surface of the rotor forcing the gases to expel through the slots. The slots also greatly improve wet weather braking by preventing hydroplaning between the pad and rotor. The slots on SP Performance rotors are machined to the minimum thickness. This is done to insure that the rotor strength is not compromised, keeping safety and reliability in mind for virtually all automotive cars and trucks. This is a bolt-on, hassle free way to greatly improve your stopping performance. SP Drilled and Slotted Rotors are a unique design offering the best combination of cooling and out-gassing. In fact, our design is so unique we would like to go over some of the details. The first thing we will point out on the drilled rotor is the chamfer. Unlike our competition there is no edge on our chamfer. This is accomplished by the use of an outer radius curve rather than a countersink. With the radius curve, or Sinusoid Curve", it virtually eliminates an edge on the surface of the hole. With no edge, there is less stress build up, thus reducing the chance of surface checking. This smooth surface also makes the rotor more pad friendly by reducing the wear of the pad caused by the friction scraping against a sharp edge. The SP Diamond Slot is a unique design in slotted technology. This design was created to maximize the out-gassing while maintaining the structural integrity of the rotor. The series of slots and diamond slots “wipes” the surface of the pad, reducing gases which build up and cause brakes to fade at higher temperatures. The slots and diamonds are machined to the minimum rotor thickness to insure rotor strength and integrity. The appearance of this design is highly desirable to the performance enthusiast wanting a new look to their vehicle.