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Introducing the BOSU Ballast Ball, now in a smaller size that is ideal for all ages. It features a six-sided surface design for proper alignment and positioning and is made of high-quality, burst-resistant material with 2.5 lbs. of multi-dimensional load. It is built to be tough and fun. Kids and adults can use it for a variety of games, exercises and other activities. This 45 cm workout ball offers an exciting, visual effect and audible feedback during lifting, shifting and shaking. A foot pump for inflation and an owner's manual are included. Choose from a variety of colors.