ITEM NAME:2 Pcs Aquarium Pond Pump Hydroponics Diffuser Fish Tank Air Stone Description: This ceramic air stone suits perfectly for fresh water and saltwater Increase oxygen levels, lower CO2 and raise pH Durable, washable and sintered by high temperature Creates fine bubbles in tank while attached to an air pump Help to creates water currents and simulation underwater scenes An important instrument to successfully keep aquatic for respiration process Specification: Material: ceramic air stone and plastic Shape: round Diameter: 100mm/3.9inch;80mm/3.15inch Thickness: 18mm/0.7inch Package Includes: 2 Pieces Air Stone(Dia.100mm and Dia.80mm) SKU: DMO0015396819420263.Increase oxygen levels, lower CO2 and raise pH. Creates fine bubbles in tank while attached to an air pump. This ceramic air stone suits perfectly for fresh water and saltwater. Material: ceramic air stone and plastic.