Features: Improve your aquarium's oxygen level and improve water quality with our efficient Oxygen Bubble Bar, promote healthy growth of your fish. The stone is sturdy and durable. It can be used for long time and get better dissolved oxygen effect. When bubble burst into the water, the sound is super quiet. Great accessories for fish enthusiasts, aquarium operators, and home aquarium users want reliable aeration solution. Suitable for home aquariums, office fish tanks, and small decorative aquariums, ensuring a better environment. Instructions for use:1. The product is used for increasing oxygen in fish tanks, and is used with oxygen pipe and oxygen pumps.2. Please soak this product in water for 15 minutes before use.3. Long time use, such as dirt blockage, bubble reduction, can be washed and reused. Tips for use: With all the accessories of the air pumps mounted properly, the atomization effect can be achieved quickly by repeatedly pulling and inserting pipe at the back door and adding water to the water pipe. Specifications: Component: Stone Size S: Approx.1.5x6.1in SizeM: Approx.1.5x10.04inch Size L: Approx.1.5x12inch Quantity: 1 Pc Package Includes: 1 pc Air Stone note: 1.Please allow 1-2cm errors due to manual measurement, note that you donot mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.