This original size Hoberman sphere is a combination of geometry, engineering and beauty that was specially designed so that at night fireflies appear as if by magic. Hang this glowing green and black sphere from the ceiling and using the pulley, create an expanding mobile that magically unfolds from 9.5" to 30"! Also included are the "21 Cool Things To Do" activity sheet and an educational booklet about the geometry of the sphere.Details:Firefly Glow10.1" x 10.1" x 9.6" package sizeContents include: 1 expanding sphere, pulley and instructionsFor 1 playerMade in ChinaBrand new condition in original packagingWipe clean with dry or damp clothFor ages 4 and up