(Purple Butterfly) Unique child-friendly seats offer the advantages of traditional wiggle seat but with a lot more fun! This seat allows children to quietly move while working, enabling them to stay on task and be more productive. Flexible nubs on one side and smaller bumps on the other give a choice for just the right amount of tactile stimulation to calm kids. Easy-inflation pump is included. Effective on chairs, benches or directly on floors. 13" diameter.