SHW Performance Drilled Monobloc Rotors PRR31424 are high-performance brake rotors designed for racing and high-performance vehicles. These rotors are made from a single piece of high-quality material, resulting in a stronger and more durable design. They feature a drilled pattern on the surface, which helps to dissipate heat and reduce brake fade, resulting in improved braking performance. The rotors also have a precision-machined surface for better contact with brake pads, resulting in more consistent and efficient braking. These rotors are specifically designed for track use and are not recommended for street driving. They are compatible with most racing calipers and are a popular choice among professional racers and enthusiasts.