Boingo Balls™ Whirl, Bounce and Even Float! The innovative, space age shape of these toys will grab your pet's attention. Hard plastic Boingo Balls are surrounded by a crisscrossing of tough rubber rings that provides easy grip and erratic bouncing. Beads inside the ball create a whirling sound that will drive pets crazy. They even float in water! Balls come in assorted colors of either red with blue or purple with yellow. Small size is great for smaller dogs and even cats.Boingo Balls are available in the sizes listed below.