One Replacement Pre Filter Sock and Mount for Prefilter for Aquarium Tank</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>High quality nylon to provides a pre filter for rocks</li><li>Easy for clean or re-use， save our world</li><li>acrylic made good quaility</li><li>Prefilter can avoid damage of skimmer for the sand or rocks drop into it</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/41%2B2kIuoL%2BL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51BvfEgI0rL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41QfycIMvqL.jpg' noproxy></br>