uxcell 10 Pcs Gray 19.6mm x 30.5mm Cylinder Mini Bubble Air Stone for Aquarium Product Name : Aquarium Air Stone;Stone Size : 15 x 25mm/ 0.59" x 0.98"(D*H) Connector Size : 5.3 x 2.5mm/ 0.2" x 0.098"(Outer Dia*Inner Dia);Total Length : 40mm/ 1.6" Material : Mineral, Plastic;Color : Gray Net Weight : 67g Package Contents : 10 Pcs x Aquarium Air Stone