Principle: This toy is a ball that neither relies on squeezing to produce sound? nor relies on batteries to supply power? instead? it mainly relies on air convection and magnetic effects to produce sound. Therefore? this ball can be played by dogs for a year or so! As long as the convection is in the right direction? this ball will produce strange sound. If your dog is smart enough? it will be able to find its own way to play after 3-5 times playGreat for the development of intelligence An essential training equipment for almost every dogModel: ADC-B6 Material: plastic Color: black Size: SDiameter: 8 cm Hole: 1.8 cm Suitable for teddies? poodles? bichon frises? pomeranians and other small sized dogs 1 x Pet toy ball<br /><img src="http://img6.eachbuyer.com/x21/p38/bj315_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x21/p38/bj315_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x21/p38/bj315_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x21/p38/bj315_4.jpg" />