Spec:

• Model number: RD-RX810
• 34T max sprocket
• 11 speed
• Shimano SHADOW RD+
• Switch stabilizer ON/OFF to match the terrain
• Total capacity: 40T
• Top sprocket: Max. 11T/Min. 11T
• Low sprocket: Max. 34T/Min. 30T
• Maximum front difference: 17T
• Compatible with current road dual control lever
• Weight: 253g

New never used, but without original retail package.