Features1Exercise Muscles: While sitting in class or working at a desk, this anti slip board can exercise your balance and overall coordination to improve core strength, core muscle groups, core stability. 2Reduce Fatigue: By using this dynadisc balance board for standing desks, you can reduce fatigue, prevent back pain, improve posture and increase alertness. 3High Safety: The balance stability disc has dual textured surface ensures a non slip grip, with massage bumps on one side and smoother bumps on the other 4Support: Sitting at a desk all day can do a number on the body. Thankfully, this stability disc also doubles as a comfy office chair cushion to provide your lower back some much needed relief. 5Versatile: Our wiggle dynadisc goes beyond core strengthening and other types of exercise. Use it in the classroom as a sensory cushion for kids, in physical therapy, or as a meditation pad to relax.SpecificationItem Type: Balance DiscMaterial: PVCDiameter: Approx. 34cm / 13.4in (Manual measurement error 1cm) before inflationFunction: Swing seat to improve sitting posture and focus on sensory children, balance plate to relieve back pain and core strengthPackage List1 x Balance Disc 1 x Pump 1 x Needle