The BOSU 2-Pack Balance Ball Trainer is a set of 6.5 inch balance pods designed for cardio workouts and core strength training. Made of durable rubber, these balance balls come in a sleek blue color with a rubber grip for easy handling. With a maximum user weight of 250 lb, these balance trainers are perfect for full body workouts at home or in the gym. The BOSU brand is known for quality fitness equipment, making these balance balls a reliable choice for achieving your fitness goals.