uxcell Fish Tank Air stone Bubble Wall Tube Airstone 7.7-inch 6 Pcs Blue Product Name : Aquarium Bubbles Air Stone;Suitable for : Fish Tank, Aquarium;Material : Rubber, Plastic,Paper Air Stone Body Length : 16.5cm/6.5";Tube Diameter : 1cm/0.4" Total Size(Approx.) : 19.6 x 2.5 x 2.5cm / 7.7" x 1" x 1"(L*W*H);Hole Outer Diameter : 5mm/ 0.02" Hole Inner Dia : 2mm/0.08";Color : Blue Net Weight : 130g;Package : 6 Pcs x Aquarium Bubble Air Stone