SHW Performance Drilled Monobloc Rotors PRR39938 are high-performance brake rotors designed for racing and track use. These rotors are made from a single piece of high-grade cast iron and feature cross-drilled holes for improved cooling and reduced weight. They are designed to withstand extreme temperatures and provide consistent braking performance under heavy use. The monobloc design ensures maximum rigidity and durability, while the drilled holes help dissipate heat and prevent brake fade. These rotors are a direct replacement for stock rotors and are compatible with most performance brake pads. They are a popular choice among professional race teams and enthusiasts looking for superior braking performance.