BOING magic light balls change color with a quick and easy squeeze of the hand.Covered in an ergonomically designed ribbed rubber, they are perfect for dazzling juggling shows, magic games or just as cool tactile mood lights.Choose from 3 light modes (constant color, slow phase and fast phase) and 7 colors, moving from one to the next simply by squeezing the ball. Boing balls feature BRIGHT LED lights, too, and they are easy on the batteries (which are included and are easily replaceable standard size batteries).An outer rubber layer makes these balls soft in the hands and easy to catch. Play with one, or buy more for juggling and other performances.Small Boing Ball is 2" diameter.Large Boing Ball is 2.75" diameter