So you were just riding along and a stick jumped up and ripped the rear derailleur off your Bandersnatch - BUMMER! These hangers will get you up and running again. A good item to pack with you and prevent being stranded and eventually eating your friends.
Stock Hanger - Direct replacement for the factory hanger that came with your frame
CNC Hanger Upgrade - Machined from 7075 aluminum then anodized black to make it supermodel sexy. This hanger is stiffer than the original providing even more precise shifting!