AquaTop MCR-500 Ceramic Rings - 500g</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Biological filtration media that promotes beneficial bacteria growth</li><li>Improved shape increases internal and external surface area for beneficial bacteria to thrive</li><li>Made of long lasting， highly porous ceramic material</li><li>Aids in the breakdown and removal of harmful ammonia and nitrite</li><li>Suitable for both freshwater and saltwater filters</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/51hvThi9IlL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/519hGgG33XL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/31b3oQ6X8qL.jpg' noproxy></br>