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. Homework, reading, drawing, eating or board games are no longer sedentary activities. 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. Adjustable Height with easy access 360° actuator ring to raise and lower the seat height. Seat height can be fine-tuned between 14' to 19'. Reduced pressure in piston allows a gentle bouncing pogo effect. Maximum load weight is 280 lb. Satisfaction guaranteed with a limited lifetime warranty. Plastic parts made in USA.