uxcell Cylinder Shaped Aquarium Air Diffuser Bubble Stone 15mm Dia 5 Pcs Gray Product Name : Aquarium Airstone;Color : Gray Material : Mineral Stone, Plastic;Cylinder Size : 25 x 15mm / 1" x 0.59" (L*D) Tube Size : 4.3 x 2.5mm / 0.17" x 0.1"(H*D) Weight : 38g;Package Contents : 5 &times; Aquarium Airstone A great way to properly aerate a home aquarium, help to keep fish healthy and adds to the beauty of the aquarium.