The SHW Performance Smooth Monobloc Rotors PFX39861 is a high-performance product designed for use in vehicles. These rotors are made from a single piece of material, ensuring maximum strength and durability. They have a smooth surface, which helps to reduce noise and vibrations during braking. The PFX39861 model is specifically designed for optimal performance and is suitable for a wide range of vehicles. These rotors are a great choice for those looking for reliable and high-quality braking components.