StopTech Power SlotAnd SportStop rotors are a direct replacement upgrade designed to fit your factory M3 brake system and stock calipers. The unique slotted or cross-drilled surface helps wipe away debris that can form between the pad and the disc, provides more initial pad bite, improves cooling, and will add a sporty track inspired aesthetic to any ride. All Power Slot and SportStop rotors feature a friction surface coating to prevent glazing as well as a durable black e-coating on the center sections to prevent corrosion and enhance the look of aftermarket wheels. StopTech Power SlotAnd SportStop rotors are manufactured to the highest tolerances of safety and quality. Designed using only the highest quality OEM replacement blanks, StopTech rotors are guaranteed to have a top shelf fit and finish.