Jardin Plastic Shell Sintered Round Bubbles 2-Piece Air Stones for Fish Tank Decoration Product Name : Aquarium Bubbles Air Stone; Suitable for : Tank, Aquarium Shaped : Round; Material : Sands and Stone, Plastic : Air Inlet Diameter : 3mm/0.11" Total Size : 10.1 x 6.9 x 1.2cm/4" x 2.7" x 0.49"(External Diameter x Inner Diameter x H); Air Inlet Stick Size : 2.6 x 0.55cm/1" x 0.22"(L x Maximum D); Color : Gray, White, Salmon Pink Net Weight : 130g; Package : 2 x Bubbles Air Stone