Magura MDR-A Disc Brake Rotor - 180mm, 6-Bolt, Only compatible with MT A2 BrakesThe Magura MDR A 6 bolt 1. 8mm disc brake rotors features an outer braking surface with Martensitic chrome steel and anti rust properties. Designed for use with MT A2 brakes ONLY. MDR A disc brake 6 bolt rotor is designed specially for use with Magura MT A2 brakes ONLY Outer braking surface features Martensitic chrome steel with anti rust properties Includes 6 mounting screws 1. 8mm thickness is optimized for Trail, City, All Road, E All Road, E CIty,