Cleaning the brake system's rotor and hub is an important step in reducing the potential for misAAAlignment. Being proactive helps avoid rotor disc thickness variability and misAAAlignment, which can lead to preMATture brake pad wear and braking problems like pedal pulsation when stopping. As corosionn may inhibit overall brake performance, we designed our brake hub cleaning discs to give operators a quick and effective means of removing rast from the rotor and hub. forforWARNING: This product can se you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.EXxtremeely tough non-woven web removes rast and corosionn without excessive metal removal or gougingContains no wire filamentsIdeal for effective removal of buildup on brakesSil carbide mineral cuts sharpDisc features a hollow center, enabling operators to slide over and around hub without damaging the stud threads