Made with Expertise Built In , the OTR 430mm x 138mm U-Type Air Disc Brake Rotor features high carbon alloy that offers durability and better heat dissipation to eliminate brake fade and increase the life of brake pads. This heavy duty air disc brake rotor also boasts attached ABS rings made of non-corrosive metals with an anti-corrosion coating. FleetPride is your First Click in Heavy Duty.