Kore KOR2113 (16.5″-24″) Kids Adjustable Tall Wobble Chair, BlueThe innovative kore wobble chair with its gently rounded Bottom encourages active sitting and allows ones knees, hips and back to find comfortable and ever changing positions; continuous movement increases Secondary focus. Great for older children and young teens, The seating height can be easily adjusted with the 360 Actuator ring to grow with your child. Suggested for ages 9 14; grade 4 9; child height 53 70.