Kore Patented ADJUSTABLE height  Active Sitting for Children, Kids, Teens: Better than a Balance Ball, Works with a standing desk, Adjusts from 15.5 to 21.5 inches, in Dark Blue Kore Adjuatable Stool Kore Adjuatable Stool Kore Adjuatable Stool Kore Adjuatable Stool Kore Adjuatable Stool