Penn Plax Cascade Pro-Carb Canister Filter for Aquariums， 8 Total Filters (4 packs with 2 filters in each pack)</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>8 Total Filters (4 packs with 2 filters in each pack)</li><li>Convenient， ready-to-use filter bags for use with your Cascade cannister filter</li><li>Contains carbon & ammonia removing zeolite crystals</li><li>Filter media fully enclosed in a disposable nylon-mesh bag</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/51xlyAsCzEL.jpg' noproxy></br>