The incredible Wubble Bubble Ball is like no other ball you've played with before! It looks like a bubble, it moves like a bubble, but you play with it like a ball! You can kick it, hit it, throw it, bounce it and even sit on it. Made of Super-Thermo Stretch-Tacular super secrete material, the Wubble Balls are soft, super soft and light, and inflate to a gigantic THREE FEET! Use the air pump with included battery to inflate or deflate your Wubble bubble ball. The Wubble bubble ball is fun to play indoors or outdoors, throughout the year. The pump requires 4 "D" batteries, not included.