This is a product for the blind that many have used around the world to play the sport of Goalball. This sport is played on an international and paralympic level by athletes. The Goalball resonates a loud, crisp, sleigh-bell sound when it is rolled. The Goalball is meant to be rolled and not bounced. Made of natural and synthetic rubber. Measures 9.5 inches, weights 2.75 pounds. For info about the game, visit the United States Association of Blind Athletes.