Medium Duty Specialty™ Semi-Metallic Rear Disc Brake Pads (SP1032TRH) by Raybestos®. Specially designed for truck, medium duty and air disc coverage from Class 1 through Class 8, Raybestos Truck and Medium Duty Specialty Disc Brake Pads provide superior friction stability over a wide range of vehicle load and brake temperature. Raybestos Truck and Medium Duty line developed for everyday heavy use situations and specially designed for fleets.