Uxcell 4" Aquarium Fish Tank Green Bubble Release Air Stones (4 Piece) Product Name : Aquarium Air Stone; suitable for : fish Tank, Aquarium Fit Air tube : 4Mm/ 0.16";Total Size(Approx.) : 10x 2 x 1.2cm / 4" x 0.8" x 0.5"(L*w*h) Main color : Green, Blue; material : Plastic, Ceramic Weight : 115g Package : 4 Pcs x Aquarium Airstone