EBC sport discs now feature reduced 3 slot venting which provides slightly less air noise under heavy braking whilst still maintaining the benefits of cooler running with the full width slot design. Another great feature of slotted discs is the way they MAINTAIN FLAT AND PARALLEL PAD WEAR and avoid the record grooves or galling common with non-slotted discs. This improves pad contact and braking throughout the life of the disc and pad set.