uxcell Aquarium Pump Hydroponics Air Stone Bubble Diffuser, 50mm, Gray Product Name : Aquarium Air Stone; Stone Size : 50 x 50mm2" x 2"(D*H) Connector Size : 5 x 3mm0.2" x 0.12"(Outer diameter*Inner diameter); Total Length : 76mm3" Material : Mineral, Plastic; Color : Gray, Black Weight : 101g Package Contents : 1 x Aquarium Air Stone