These disc brake pads fit a variety of Shimano brakes and offer industry-leading brake compounds for consistent, confident performance. Pro Extreme Sintered pads feature an aggressive compound that provides maximum stopping power making it perfect for DH riding The dense, sintered compound also resists water making it extremely effective in wet conditions Compatible with Shimano R9170, Metrea U5000, Ultegra R8070, and Road RS305, RS405, RS505 and RS805 Compatible with Rever MCX1 Flat-Mount and MCX2 Flat-Mount