Url: https://www.abilitations.com/products/sportime-stabili-t-stool-tube-15-inch-seat-colors-vary The Sportime Stabili-T-Stool is a great product for students with special education needs. This stool is designed for use on carpeted floors or non-slip surfaces only. The stool is great for sensory stimulation and core stability. The stool measures 15 inches in a variety of colors. The stool is from School Specialty, the leader in education solutions.