Two rubber balls that look, feel, and squeeze the same - but try bouncing them! These intriguing inelastic and elastic collision balls are popularly called “happy and sad.” One ball rebounds normally while the other is as bounceless as a piece of clay! Instructions included.
Prices listed are U.S. Domestic prices only and apply to orders shipped within the United States. Orders from outside the
United States may be charged additional distributor, customs, and shipping charges.