uxcell Round Aquarium Fish Tank Diffuser Oxygen Bubble Air Stone Green Gray Color: Green, Gray; Package Content: 1 x Aquarium Bubble Air Stone Total Size: 123 x 100 x 12mm / 4.8" x 3.9" x 0.47" (L*Dia*T); Material: Plastic, Stone Product Name: Aquarium Bubble Air Stone Net Weight: 58g Outlet Hole Diameter: 3mm