Here’s an example of a unique rotor slot design. Raybestos’ R-300 performance rotors feature an “S-Groove” slot design that simultaneously allows for out-gassing on both leading and trailing ends of the pad’s swept area while maintaining maximum surface contact. The slot design is also non-directional, allowing the same rotor part number to be installed on both sides of the same axle. The high carbon rotor features a “Black Fusion” corrosion-preventative coating on the hat and a “Grey Fusion” corrosion-resistant coating on the disc. The rotor reportedly is able to withstand 300 hours of saltwater exposure.