Top-of-the-line rear derailleur with generous use of carbon fiber and titanium for maximum performance at minimal weight. Carbon fiber and aluminum construction. Compatible with other SRAM 10-speed drive train components. Ceramic bearing pulleys. Titanium hardware. Item Specifications: Color, Silver/Black, Weight, 151, Largest Cog, 32, Chain Wrap Capacity, 37, Cage Length, Medium, Drivetrain Speeds, 10, Rear Der/Shifter Compatibility, SRAM Exact Actuation, Rear Derailleur Mount Type, 10x1 Standard,.