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. Great for younger children, the seating height can be easily adjusted with the 360 degree Actuator Ring to grow with your child. Suggested for ages 6-11, Grade 1-6, child height 45"-57". Infused with Smart Plastic™, an anti-microbial agent that inhibits germs from growing on the stool's 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. Third-party tested and passes government regulations for children's safety. Assembles easily in 5 easy steps and is made of durable, recyclable plastic and steel piston. Recommended age 6-11 years