Specification AirFlowCapacity : 950 gallons_per_hour Brand : AQUANEAT BulletPoint1 : Fine bubble: Compared with ordinary bubble stone, creating more fine bubbles, makes the dissolved oxygen amount larger BulletPoint2 : Widely applicable: Suitable for hydroponic systems, aquarium fish tanks, preventing ponds freezing in winter, helping extend the life of your nutrient solution, keep fish/ roots healthy and promote plant growth BulletPoint3 : Air Stone Dimension: 2 "D; Connector Diameter: 3/16"/ or 3/8"; Recommended air pump power: > 4 W BulletPoint4 : Quality material: Made of mineral material and sintered at a high temperature; Stable and durable, long lasting use ; Safe to your fish BulletPoint5 : Note: You have to soak it in water for about 30 minutes before connecting to an air pump to run it; Clean it after a period time of use Color1 : Gold Color2 : Silver Color3 : Black Color4 : White ExternallyAssignedProductIdentifier1 : 661757723842 ExternallyAssignedProductIdentifier2 : 0661757723842 GpsrSafetyAttestation : 1 ImportDesignation : Imported ItemName : AQUANEAT Air Stones for Ponds 2 Inch, Long Lasting Aerator Oxygen Diffuser, Air Pump Accessories for Aquariums, Fish Tanks, Hydroponics and DWC Reservoirs 4 Pack ItemPackageDimensions_Height : 16.6116 centimeters ItemPackageDimensions_Length : 5.3086 centimeters ItemPackageDimensions_Width : 12.9032 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : aquarium-air-pump-accessories Manufacturer : AQUANEAT Material : Aluminum ModelNumber : 43237-2 NumberOfBoxes : 1 OperationMode : Automatic PartNumber : 43237-2 Pattern : Plastic outlet 4 Pack PowerSourceType : Corded Electric ProductDescription : Aquarium air stones moderate in size and outputs a large steady stream of tiny bubbles, no leaks, add enough oxygen to your fish, and also make your fish tank more beautiful. Air stones extend the life of your nutrient solution, help keep roots healthy, and promote exceptional growth. This stone is a must have for your aquariums. Specifications 1. Color: Gray 2. Material: Silicon carbide, plastic 3. Suitable occasion: fish tank, aquarium, hydroponics,ponds and so on 4. Size: approx. 2" D 5. Each Weight: 108g/3.8oz Package Included 4 pieces of gray ball shape air stones Notes Please soak the air stone in water for about 30 minutes before first use. If the air stone doesn't have bubbles in one part, please change the pump of higher power. After a long-term usage, please clean it if bubbles lessen.