uxcell Fish Tank 4" 100mm Green Plastic Frame Blue Mineral Air Bubble Release Oxygen Diffuser Airstone Bar Product Name : Aquarium Air Stone; Suitable for : Tank, Aquarium Shaped : Bar Design; Material : Mineral, Plastic Outlet Connector Diameter : 4mm0.16"; Stone Length : 10cm4" Total Size (Approx.) : 11.5 x 2 x 1.2cm4.5" x 0.8" x 0.5" (L*W*T); Color : Green & Blue Weight : 130g; Package : 5 x Aquarium Air Stone