Add a little more metal to the tunnel of your snowmobile. The CFR Blades are designed to be fastened to the outside or inside of the rear tunnel of your Ski Doo snowmobile to add stiffness and strength. We strongly recommend fitting a set of Blades if you travel frequently on bumpy roads or trails while carrying extra weight on the tunnel of your snowmobile. Features: Anatomically designed to fit the rear tunnel Hard wearing anodized black finish. Complete left/right set (mounting rivets included for XP/XM) Made in Canada.