New Swingarm Chain guide or (seal guard) as Yamaha Calls it. This attaches to the front of the swingarm so the chain slides on it and doesn't ruin the swingarm. These need to be replaced before the chain wears through and damages the swingarm and you wont be able to change your bearings.

Fits the models below

2011-2013 YFM125 Raptor

2008-2013 YFM250 Raptor