[Quality]: Aquarium bubbles are made of environmentally friendly plastic and high-quality sand, which are durable and can transport oxygen more efficiently. [Function]: Multifunctional aquarium lines are used for decorative and functional bubbles, and the rising bubbles improve the ventilation and water flow of the aquarium. [Applicable width]: Very suitable for your aquarium or fish tank, and also the best partner for the air pump, the length is 30 cm/12 inches. [Easy to clean]: You only need to clean them regularly with a brush, because they will become clogged after weeks or months [Excellent performance]: Must be used with an air pump and trachea, with good performance (excluding air pump and trachea), it is an indispensable tool for aquatic fish to breathe successfully. Description 1. Aquarium air bubbles are made of environmentally friendly plastic and high-quality sand, which are durable and can transport oxygen more efficiently. 2. Multifunctional aquarium lines are used for decorative and functional air bubbles, and the rising air bubbles improve the ventilation and water flow of the aquarium. 3. It is very suitable for your aquarium or fish tank. It is also the best partner for the air pump. The length is 30 cm/11.8 inches. Technical Data: Material: Plastic Color: Blue Length: 30 cm/12 inches Package Includes: 3 X Aquarium Air Note: Due to lighting effects, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item.