Sonline Fish Tank Aquarium 20" Long Bubble Release Air Stone Airstone Green Blue Product Name : Aquarium Air Stone;Color : Blue, Green Material : Mineral Stone;Stone Size : 51 x 1.1cm/20" x 0.43"(L*W) Outlet Size : 1.5 x 0.46cm/ 0.59" x 0.18"(L*D); : 54 x 2 x 1.4cm/21" x 0.79" x 0.55"(L*W*T) Weight : 142g Package Contents : 1 x Aquarium Air Stone