The innovative Kore Design® Wobble Chair with it's gently-rounded bottom encourages active sitting and allows one's knees, hips and back to find comfortable and ever-changing positions; continuous movement increases Secondary Focus. Suggested for ages 8-9; Grade 3-4; child height 50"-53". The Kore Wobble Chair™ is infused with Smart Plastic™, an anti-microbial agent that inhibits germs from growing on the stool's plastic surface. Provides an outlet for children with high energy or sensory seating needs like ADHD or Autism. A patented anti-tip safety ring on the gently-rounded base prevents tip-overs and falls. Assembles easily in 3 easy steps and is made of durable, recyclable plastic. Recommended age 8-9 years