The SHW Performance Drilled Monobloc Rotors PFR39966 are high-performance brake rotors designed for use in racing and high-performance vehicles. These rotors are made from a single piece of cast iron, providing superior strength and durability. The rotors are drilled to improve heat dissipation and reduce brake fade, allowing for better overall braking performance. The PFR39966 model is specifically designed for use on a variety of vehicles, including sports cars, muscle cars, and high-performance sedans. These rotors are a direct replacement for OEM rotors and are compatible with most aftermarket brake systems. They are precision-machined for a perfect fit and feature a corrosion-resistant coating for long-lasting performance. Overall, the SHW Performance Drilled Monobloc Rotors PFR39966 are a top choice for those seeking improved braking performance and reliability in their high-performance vehicle.