The Kore Wobble Chair has a gently rounded bottom to encourage active sitting and increases secondary focus. Great outlet for kids with high energy or sensory needs like ADHD or Autism. A patented anti-roll safety ring on the gently-rounded base prevents tip-overs and falls. Antimicrobial protection. Lifetime warranty. Made in USA. Ages 18 months â€“ 3 years Assembles easily in 3 easy steps and is made of durable, recyclable plastic. Child height 33â€ť-38â€ť Check out the Kobe Wobble Chairs for all ages and sizes up to Adult.