Shimano Ultegra 6600 8 9 10 Speed Rear Derailleur

This is a rear derailleur that is compatible with 8-, 9-, and 10-speed drivetrains, is light and durable and is ideal for top level road use.
It has an advanced wide link design and is super stiff for fast and accurate changes across the cassette.
It also has 11 tooth pulleys that increase service life and reduce noise, sealed bearing tension that is smooth and durable and a super light shift action.
It comes in an Ultegra finish and weighs 219g.
Ultegra SL comes in Ice Grey finish and weighs 220g.