??Made of the process of the use of the process? the internal hollow? super buoyancy<br /><img src="http://img6.eachbuyer.com/x9/p100/eb9563_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb9563_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb9563_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb9563_4.jpg" />