Ergonomically designed, the Kore Wobble Chair transforms the conventional boring seat into a playground for your child's imagination. The innovative Kore Wobble Chair encourages active sitting and allows one's knees, hips and back to find comfortable and ever-changing positions. Patented textured design on seat and base to prevent slips; no rubberized bottoms because to hold dirt that causes scratches and scuffles to school floors. Dimensions: 11" diameter seat, 13.75" diameter base, 12" height. Made of durable and recyclable HDPE #2 plastic. Max load weight of 275 lbs. For ages 3-5 or height of 40"-43".Details:Available in multiple colors11" seat diameter, 13.75 base diameter, 12" height3 pieces (seat, post, base)Provides an outlet for all high-energy childrenPerfect design for special needs students with ADD, ADHD, and autismThe Kore Wobble Chair has proven to increase secondary focus in the classroomPatented anti-roll safety ring on base prevents tip-overs and fallsGentle-rounded, stable base moves with child and rests naturally uprightFriction grips to easily assemble or disassemble and save storage space when not in useFor ages 3 to 5