Blue Stability or Balance Disc Perfect for At Work, Home or School Fitness 13" Diameter Balance and Stability disc with two choices on each disc: small dimples for sitting or large dimples for standing. Helps improve balance, stability, flexibility and coordination and is easy to use at home or in the office. Perfect for school children of all ages to keep them engaged in learning and exercise. Has shown to help kids relieve pent up energy, allowing them to focus on tasks and lessons. Use it to improve your balance by engaging your core muscles through various uses. Best used while standing on the disc with one foot, alternating after a set period to the other foot, while engaging your core. It can also be used sitting to improve posture by placing the disc either side up based upon personal preference, sitting tall, rolling your shoulders back to a perfect posture pose, and engaging your core. The stability disc can also be used for active exercises Made from phthalates free pvc. Package includes a free 6" hand pump for easy inflation. Cusion is delivered deflated. See instructions below for assistance in inflating