Gaiam Kids Balance Cushion, Inflatable Wobble Disk Active Sitting Chair Seat Cushion with Inflation Needle Use the stability cushion to easily convert any chair into an active seat for your child Balancing on the disk encourages kids to learn healthy posture and practice sitting up straight and attentively at home or in class Inflatable balance disk is perfect for classrooms and at-home work spaces as the constant movements while sitting on the cushion increase blood flow to the brain, allowing kids to focus and concentrate to get more done! Great for kids ages 5 to 12 years old as an ideal alternative seating tool for Elementary & early Middle School classrooms Color: Blue. Dimensions: 13" x 13" x 1.2". Includes inflation needle