This is the aluminum case saver by http://www.bbaluminium.com/index.htm .It's much stronger than stock with 4 anchor screws instead of two. Also, the front of the B&B case saver butts up against the outside of the engine case. It's made of quality lightweight aluminum, and has a series of tapered machined holes that give it a trick look. Comes with a bunch of cool decals too. Two of the four mounting holes had to be elongated slightly with a rat-tailed file before it would fit properly. It was also unfinished with burrs and felt tip marker marks at the offsets. All in all, a nice looking accessory that adds a bit of piece of mind in the event the chain would break.