This is a Shimano 600 Ultegra (RD-6400) rear derailleur. It is most recognizable by the "tri-color" logo. This series of 600 is considered the first generation of Ultegra. It is SIS, STI, and friction-style shifting compatible. It is a short-cage derailleur, so it can accommodate gearing up to 28-teeth. It is 6 and 7-speed compatible as well.
Weight = 215g
Material = Aluminum
Condition = Good, few scratches, but functions well
This is a used product and is sold as-is. Photo is representative. We do our best to represent products accurately, but be aware that the actual product condition may differ.
Feel free to contact us with any questions or inquiries!