Zyhw Aquarium Ponds 2.3 Inch Diameter Air Stone Bubble Diffusers Product Name : Aquarium Air Stone;Stone Size : 59 x 84mm/ 2.3" x 3.3"(D*L) Connector Size : 0.2" Outer Diameter Main Material : Mineral, Plastic Easy to clean and reuse Provides a continuous tower of bubbles to help aerate your aquarium