API Nexx Foam 30 PPI， 2-Count</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Filtration foam for nexx external filter</li><li>Ideal thickness to filter small particles</li><li>Wash foam thorougly each month in aquarium water and replace every three months</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/416hb4RxhVL.jpg' noproxy></br>