Amazon.com: Gaiam Kids Balance Ball - Exercise Stability Yoga Ball, Kids Alternative Flexible Seating for Active Children in Home or Classroom (Satisfaction Guarantee), Blue, 45cm (2.09 Pounds) : Sports & Outdoors
Amazon.com: Exercise Ball for Yoga, Fitness, Balance Stability, Extra Thick Professional Grade Balance & Stability Ball - Anti Burst, Workout Program 2020 (Blue, 45cm) : Sports & Outdoors