Giant tennis ball 24 CM Pet TOY Signature MEGA JUMBO Big Tennis ball Fashion TO ;ITEM#-GBN812-GJ3Y/4S2R14456 Use for signature or pet toys. You received the ball that is no air inside,you need to inflate it. BTW, please fill the ball as harder as possible. This ball is made of a rubber core of a basketball and common felt of tennis ball, it's much thicker than a normally pet tennis ball. But if you doggie is very naught or fierce, please choose it discreetly. some kids are really a toy killer,please notice that.