This air stone is quite an aquarium accessory for your fish tank. It can create much bubbles when attached to air pump and connecting pipe (not included) and help increasing the livability of fish. It is small in size and will not take much place of your tank. Features: It is adjustable and can increase the oxygen of your fish tank. Have a sucker, thus it can be set at any place of the tank. To help the respiration process of your fish. Used with air pump and connecting pipe (not included) to create air bubbles. It is small and will not take much places of your tank. It can make numberous bubbles to create a fantastic scene. Specifications: Color: Blue Material: Plastic Diameter of the Air Bubble Ball: 1.7cm / 0.67in Sucker Diameter: 2.7cm / 1.06in Item Size: 3.4 * 2.7 * 2.3cm / 1.34 * 1.06 * 0.91in Item Weight: 5g / 0.18oz Package Size: 7.5 * 3.5 * 1cm / 2.95 * 1.38 * 0.39in Package Weight: 5.5g / 0.2oz Note: Connect this oxygen increase ball with air pump and connecting pipe. It can connect the pipe whose diameter is around 0.4cm. Package List: 1 * Air Increase Ball