4 available ; Item Number. EBC for Audi S4 Supercharged USR Slotted Front Rotors - ebcUSR ; Quantity. Black Thermic coating leaves a nice finish and protects the rotors against corrosion. Deep cryogenic treatment is a one-time process that permanently improves the performance and wear characteristics of metal components, from brake rotors and. Forced Induction. . Built to last. ; Other Part Number. Precision slotted screwdriver made of chrome-molybdenum-vanadium steel. Read more. Manufacturer'sWarranty. A handle made of nylon plastic with a fast-turning TPR anti-slip top. ebcUSR The unique slotting aids with heat and brake dust dispersal, prevents glazing of the pads, adds bite and improves wet and dry braking performance. Pro'skit SDS4 Non-magnetic Precision Ceramics Driver Slotted Screwdriver Tool With Blade. Lexus IS-F. StopTech Audi S4 SportStop Cryo Slotted & Drilled Front Right Rotor StopTech Sport Rotors are also available with an optional cryogenic treatment. Tuning & Gauges.