EBC Brakes USA series slotted rotors feature a new narrow slow to eliminate wind noise heard when using most Sport rotors which means they are noise free from the get go. Black geomet coating leaves a nice impressive finish and protects the rotors against corrosion for the life of the rotors.. another great feature of slotted rotors is the way they maintain flat and parallel pad wear and avoid the record grooves or galling common with non-slotted rotors. This improves pad contact and braking throughout the life of the rotor and pad set