The SHW Performance Drilled Monobloc Rotors PRX39873 are high-quality, high-performance brake rotors designed for use in performance vehicles. These rotors are made from a single piece of metal, making them stronger and more durable than traditional two-piece rotors. They feature drilled holes for improved heat dissipation and reduced brake fade, resulting in better overall braking performance. These rotors are specifically designed for use in high-performance vehicles and are a great choice for drivers looking to upgrade their braking system.