The mini Rainbow Hoberman Sphere expands from 5 inches to 12 inches in diameter. Push any hub and watch it contract! The Hoberman Sphere is great for helping children with special needs visually understand deep breathing and expanding their chest cavity for relaxation. It also provides a great sensory toy for individuals with Autism and SPD as the colorful sphere expands and contracts. The sphere is also used in special needs yoga classes, as a reinforcer for ABA programs and more. Comes fully assembled, with a selection of game ideas.