Gold Wing Aquarium Fish Tank Ponds Silicon Carbide Air Stone Diffusers Gray 100% Brand New and High Quality Material: Silicon Carbide; Size: 8cm(Diameter) x 2cm(Thick); Inlet Connector Size: approx. 2.5cm It produce the fine sufficient bubbles in the fish tank Beautify your fish tank and provide refresh oxygen,then keep the fish healthy Package:1 * Air Stone