The SHW Performance Drilled Monobloc Rotors PRL39937 are high-performance brake rotors designed for use in high-performance vehicles. These rotors are made from a single piece of high-quality material, ensuring maximum strength and durability. They feature a drilled design, which helps to dissipate heat and prevent brake fade, allowing for consistent and reliable braking performance. These rotors are specifically designed for use in racing and other high-performance applications, making them a popular choice among enthusiasts and professionals alike.