uxcell 20x80MM Aquarium Sintered Cylinder Shaped Dark Gray Mineral Bubbles Air Stone Airstone Color: Black,Gray; Package content: 1 x Aquarium Bubbles Air Stone Total size: 9.8 x 2.3cm / 3.8" x 0.92"(L*w); material: Plastic,Mineral Net weight: 42g Product Name: Aquarium Bubbles Air Stone Import diameter: 4.5Mm/ 0.18"