These rotors are the exact same size as the factory rotors. This allows you to upgrade your rotors without upgrading to very costly brake calipers. After several stops, spirited driving, and under emergency braking, they will perform better than your original brake components. Power Slot Rotors are designed to maximize your braking performance while staying with the original equipment size rotors and brake pads. . All holes are radiused to the correct wear limit. Radiusing, unlike chamfering, provides a smooth transition from rotor surface to the cooling holes. This reduces stress points and allows superior pad performance. All rotors are constantly checked for accurate balancing and are designed with a unidirectional pattern. A pair must consist of a left and a right rotor. All rotors are cadmium plated to military specifications for a high performance look while also protecting the machined areas from the elements. With its directional swept slots, the brake system is able to dissipate the hot brake gases that are emitted under all braking conditions.