SRAM 2012+ Red 10 Speed Short Cage Rear DerailleurTop of the line rear derailleur with generous use of carbon fiber and titanium for maximum performance at minimal weight. Ceramic bearing pulleys Titanium hardware Carbon fiber and aluminum construction Compatible with other SRAM 10 speed drive train components Item Specifications Color Gray Black Weight 145 Largest Cog 28 Chain Wrap Capacity 33 Cage Length Short Drivetrain Speeds 10 Rear Der Shifter Compatibility SRAM Exact Actuation Rear Derailleur