Shimano Dura Ace 7700 11t Inner 9 Speed Cassette

This is a lightweight, 9 speed cassette, with sprocket sets in the range of 11 to 21 and 11 to 23 tooth.
It has both Titanium and Chromoly sprockets, mounted on a lightweight alloy carrier, that combine to keep the weight down, yet maintain strength and assure maximum torque response.
The sprockets also have a Hyperglide (HG) tooth profile and shift ramp position that improves chain control during shifting.