Features: Improve your aquarium's oxygen level and improve water quality with our efficient Oxygen Bubble Stone Set, promote healthy growth of your fish. The stone is durable. It can be used for long time and get better 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. Need to connect air pumps for use. Specifications: Component: Plastic Color: 3 Option Pipe Length A: Approx.400cm/157.48inch Pipe Length B: Approx.500cm/196.85inch Pipe LengthC: Approx.800cm/315inch Package Includes: 1 Set 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.