uxcell Aquarium Decor Assorted Colors Plastic Bubble Air Stones 2.5" Height Product Name : Aquarium Air Stone; Suitable for : Fish Tank, Aquarium Shaped : Cylinder Design; Material : Mineral, Plastic Import Diameter : 3mm0.12"; Import OD : 4.5mm Size(Approx.) : 1.5 x 5.5cm 0.6" x 2.2"(D*H); Color : Red, Blue, Green, Purple, Yellow, White Weight : 32g; Package : 2 x Aquarium Air Stone