The original model of our mountain bike bell, Timber 3.0 is a solid brass bell with a sleek black finish and a crisp, clean sound. It includes two separate o-rings to fit all handlebar sizes and is easy to move between bikes. - Upgraded version has a slimmer profile on your handlebars, smoother shifting between ring modes, and we've beefed up the strength of the internal clapper cable and the lever handle for longer life. - We've also upgraded the backing pad to a much grippier rubber that prevents the bell from movement while shifting between ring modes. The new pad is much more durable than the old pad and won't wear out.