This is a SRAM Force 1 Type 2.1 rear derailleur. This is an 11 speed model but SRAM says that it will also work find with the 10-speed Exact Actuation drivetrains. This derailleur features all of SRAM’s nice tech - X-Sync, Cage Lock, Exact Actuation, a Roller Bearing Cluth and X-Horizon design. This is a long cage model, rated by SRAM to 42 teeth. The pulleys are 75mm apart, measured from center of one mounting bolt to the center of the other - curiously SRAM has not published cage length measurements.

This derailleur has seen low miles and is in good-nice condition. It is fully functional. The pivots are smooth and the springs feel great. There is barely any wear on the pulleys. All threading is fine. The flaws are cosmetic - there is a bit of wear and tear to the paint. I have uploaded large photos. Please take a look and ask if something is unclear. Thank you.