This is for the serious sponge ball worker. A small red sponge ball, about 2 inches in diameter, is pushed into your closed fist. When you open your hand the small ball has changed into a huge 5 inch diameter sponge ball! There is no other ball in sight and there are no sleights nor any moves to "vanish" the small ball. Unbelievable but so easy to perform. Just remember, the ball that enters your fist IS THE SAME BALL THAT IS REVEALED!