DRILLED u0026 SLOTTED BRAKE ROTOR FACTS by TheRamManINC com Non-ferious Compound(Non-metal) faster break in Thermal Scorched. Front &rear drilled slotted brake rotors & ceramic pads chevy gmc 2500 3500 hd machined surface to ensure synergy between the brake pad and brake rotor during the break-in period. Thickness 36.5 mm, Num. Designed to obtain peak performance under all braking conditions.