This is a Shimano Ultegra rear derailleur, model number RD-6500, for 9 speed drivetrains. This is the short cage version, which handles up to 28T cogs and a 29 tooth gear range. This derailleur is in good condition. The pivots are smooth with no binding or excess play, and the return springs are nice and snappy. All bolts and threading are A-OK. There is only light wear on the pulley teeth, they are good for many many miles. Cosmetically, there are scratches from use, thus the price.I have posted large photos. Please take a look. Thanks!