Plastic End 2-Piece Air Stone Bars, 4-Inch, Blue/Green Product Name : Aquarium Air Stone; Color : Green & Blue; Weight : 53g Suitable for : Tank, Aquarium; Shaped : Bar Design; Material : Mineral, Plastic Outlet Connector Diameter : 6mm/0.24" (Maximum); Stone Length : 10cm/4" Total Size (Approx.) : 11.2 x 2.1 x 1.3cm/4.4" x 0.8" x 0.5" (L x W x T) Package : 2 x Aquarium Air Stone