Eshopps AEO19055 Round Foam Filter， Large</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Mechanical Filter Sponge for Zoo Med's 501 External Filter</li><li>Grabs particulates</li><li>Removes debris</li><li>Just rinse and drop in</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/41YxXjELitL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41Gaf4nlGlL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/31zYCYuI91L.jpg' noproxy></br>