Frozen rotors has been slotting brake rotors for our customers for the last ten years. Slotting is performed on a cnc machining center for precise accuracy and balance, to the discard depth of the brake rotor so when the slots are no longer visible you will know that the brake rotor needs replacing. Frozen rotors - slotted brake rotors provide your vehicle with better brakes by reducing brake fade when brake pad gasses build up on the rotor surface. They will give you better stopping power in wet weather by providing a channel for water to escape. On top of that, cryogenically treated brake rotors resist cracking, warping and fading; frozen rotors last 2-3 times longer than normal rotors. Slotted brake rotors keep the brake pads clean which gives you improved brake bite. Sold each, fits right side.