SODIAL(R) 5 Pcs Fish Tank Bubble Maker Air Stone 25mm Diameter Gray Product Name : Aquarium Air Stone;Shaped : Round Design Material : Mineral, Plastic;Import Diameter : 2.5mm/ 0.1" Size(Approx) : 2.5 x 4cm / 1" x 1.6"(D*H);Color : Gray, Black Weight : 75g Packag : 5 x Aquarium Air Stone