This Shimano Ultegra RT800 Centerlock IceTech Disc Brake Rotor has a diameter of 140mm and is made of aluminium and steel. The rotor comes in a stylish silver colour and is compatible with Shimano bikes. It is suitable for a range of bike types including road bikes, hybrid bikes, and mountain bikes. The rotor is designed to provide maximum stopping power while maintaining excellent heat dissipation. The package includes a single rotor and is easy to install with a centre lock mounting type. The Shimano Ultegra RT800 brake rotor is a great addition to any bike for a smooth and safe riding experience.