Your looking at a used SRAM Rival 10 speed rear derailleur. The derailleur is in good shape. It shows a little bit of road rash and what looks like a bit of rack burn, but functions just fine. How ever both pulleys are cracked (see photos). I don't think I saw any SRAM derailleurs from this generation, either road or mountain, that didn't crack the pulleys. Replacements are pretty easy to find.
Thanks for taking a look and feel free to message me with any questions.