BLACK Filter Media X-Lg Density Half Sheet 39" x 24"</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>The open， highly aerobic tri-dimensional structure of Matala Filter Media promotes healthy water conditions</li><li>Ease of cleaning in in a wide variety of filter designs.</li><li>You'll see it featured in every major Pond， Koi & Fish Care Magazine.</li><li>Mats are self-supporting， form-stable， rigid and non-brittle</li><li>This is simply the most effective， longest lasting， crush resistant filter material available today!</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/61E4p7ifvoL.jpg' noproxy></br>