The redesigned BOSU Sport 50 cm. Balance Trainer, a smaller version of the original BOSU Balance Trainer (65cm), is constructed with the same rim and base style. The sleek, compact design of the BOSU Sport 50cm Balance Trainer allows for easy transportation and storage, quick positioning for any type of workout, and is ideal for fitness enthusiasts and athletes of all ages. The smaller size offers a variety of configuration, stance, and workout options, especially when paired with additional BOSU Sport 50 cm. Balance Trainers, BOSU Balance Trainers, BOSU Elite, or BOSU Ballast Balls. Made in the USA.