The mutton busting bull bell is 4" inches in length. We suggest this bull bell for both our mutton rope and our calf ropes. This bell is more of a economy type bell, so if your looking for more of quality bell you would want to purchase one of our 5" steel bull bells. Bells are used for adding weight to ropes to pull your rope off after your ride. Most associations require you to have at least one bull bell. You will need a "Bell Strap" to attach your bell to your rope. For any questions call us at 260-748-7620.