Plastic Shell Aquarium Tank Bubbles Air Stone 12 Inch Long 4pcs Green Color: Green, White; Package Content: 4 Pcs x Air Stone Total Size: 30 x 2 x 1.4cm/12" x 0.8" x 0.5"(L*W*T); Material: Mineral, Plastic Product Name: Air Stone Net Weight: 269g Hole Outer Diameter: 5mm/0.2"