uxcell Aquarium Dark Gray Round Mineral Bubble Air Stone 150mmx18mm</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Product Name : Aquarium Bubble Air Stone;Suitable for : Fish Tank， Aquarium</li><li>Main Material : Mineral;Air Stone Size(excluded connector) : 150 x 18mm/ 5.9" x 0.7"(D*T)</li><li>Connector Size : 2.5 x 5mm/ 0.09" x 0.19"(Inner Dia*OD);Total Length : 17.5cm/ 6.8"</li><li>Color : Dark Gray;Net Weight : 309g</li><li>Please soak the air stone in water for at least 15 minutes before use.</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/51yva58MKPL.jpg' noproxy></br>