Aquarium Air Stone with Control Valve High Dissolved Oxygen Rate Ultra Silent Hydroponic Fish Tank Oxygen Diffuser for Aquarium . Description: What this product can offer you is that it has high dissolve oxygen rate which will produce fine bubble without hurting your fish, and providing enough oxygen. Produced with compact sizes that you can choose suitable refiner to use for placing in fish tank, and it will be flexible to observe with transparent surface texture. It is constructed of plastic material. The aire stone length is 5.5cm, height is 7cm, the air diffuser length is 4cm, height is 2.5cm, the pipe diameter is 0.4cm. It is suitable for placing in fish tank to create oxygen for water plant and fish. Item Name: Air Diffuser Material: Plastic Features: Solid, Anti-Scratch, Effective Suitable: Fish Tank, Aquarium Size Details: Air Stone Length: 5.5cm/2.17" (Approx.) Air Stone Height: 7cm/2.76" (Approx.) Air Diffuser Diameter: 4cm/1.57" (Approx.) Air Diffuser Height: 2.5cm/0.98" (Approx.) Pipe Diameter: 0.4cm/0.16" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Air Diffuser