The Timber Bolt-On Mount-Yew! Mountain Bike Bell has the same sweet sound and performance of their existing bells, plus a handful of nifty improvements. It's built stronger, and all parts are now completely modular, including the cable and clapper ringer system. If anything wears out or breaks, you can replace it quickly and easily. If you ride hard and often, the all new Timber Model Yew! is just what you've been asking for