Fluval 306/406 Bio-Foam</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Enhances biological filtration</li><li>Effectively captures small particles and debris</li><li>Adds a second layer of mechanical filtration</li><li>For freshwater and marine environments</li><li>Includes 2 bio-foam pieces that fit fluval 306/406 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/514hcZqpLLL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/416PWCZhN-L.jpg' noproxy></br>