SRAM X0 Rear Derailleur, 9 Speed, Blackbox Carbon, Mid Cage, XO.
In good usable, working condition. Still useable when taken off bike but I've noticed that jockey wheels (cheap $20 part) need to be replaced for optimal performance - one is cracked, one has worn teeth. Hence price reflects this.
Some scuffs from moderate use. Pics will describe condition.
Worldwide postage.