uxcell Plastic Encased Aquarium Royal Blue Bubble Air Stone (4 Piece) Product Name : Aquarium Bubbles Air Stone; suitable for : fish Tank, Aquarium Material : Mineral, Plastic; Air Stone body length : 10cm/ 4" Total Size(Approx.) : 11.5 x 1.9 x 1.2cm / 4.5" x 0.75" x 0.47"(L*w*h);hole outer diameter : 5Mm/ 0.02" Hole inner Dia : 2Mm/0.08";color : Green, Royal Blue Net weight : 110g;Package : 4 x Aquarium bubble Air Stone