Jardin Sintered Mineral Bubbles 5-Piece Air Stones for Aquarium, White/Beige Product Name : Aquarium Bubbles Air stone; Suitable for : Fish Tank, Aquarium Material : Mineral, Plastic; Air Tube Outside Diameter : 6mm Air Stone Size(excluded connector) : 4.6 x 2.3cm/1.8" x 0.9"(L x D); Total Length(Approx.) : 6.3cm/2.5" Color : Beige, White; Weight : 147g Package : 5 x Aquarium Bubbles Air stones