Lee's Pet Products ALE12520 6-Pack Discard a Stone Disposable Air Diffuser for Aquarium Pump， Coarse</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Lees discard a stone 6pk coars</li><li>Under gravel filters， aquarium decorations， or sponge filters will benefit from these easy-installation air stones</li><li>Available in a 6 pack</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/41caqNMZVVL.jpg' noproxy></br>