NUOMI Black Aquarium Fish Tank Filter Bio-balls Filtration Media 16mm (pack of 50)</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>100% Brand New</li><li>Diameter of bio ball: 16mm</li><li>BIO-Balls do not require replacement unless damaged or destroyed</li><li>In the event of excessive buildup， you may gently rinse with water from an established aquarium， if desired</li><li>The bio-sponge inside provide more surface area for growth of beneficial Bio-Spira bacteria</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/51879engThL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/61hhcQOwnvL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/617Z-BS3NUL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/515oQn6kTYL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51My4ELEjCL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51bMB57JUsL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51ygUgHAohL.jpg' noproxy></br>