Our case savers are made from a solid aluminium alloy billet, these are two part case savers which wrap around the frame in two places and sits flush up to the clutch mount. These are designed to take a 15 tooth sprocket. Over the years we have tried virtually every other make of case saver that's been available, it's all that people talk about on forums. Our case saver is in a league of it's own, as strong as a bank vault, these are only being made in limited numbers, so order one soon whilst you can.