It's the original Hoberman toy and it's now a classic and a favorite of kids and adults everywhere. It expands from 9.5" to 30" in diameter with a magical motion that amazes everyone that sees it. Everyone in the house should have their own, because nobody will want to share.All Spheres comes with a pulley, hardware and instructions to hang as a cool, kinetic mobile an educational booklet about the geometry of the Sphere and a "21 Cool Things to Do" activity sheet.