Size: inner diameter 4mm, outer diameter 6mm, length 5 meters Muti-functional: Use as water hose, air hose, etc. Material: PVC Color: Transparent Product name: Special special pipe for oxygen pipes / air pumps for fish tanks Product specifications: Inner diameter 4mm, outer diameter 6mm Product features: The pneuma used to pump oxygen into the oxygen pump, a translucent milky white, different from the general trachea on the market, elasticity and material are better than the general trachea. Durable, reasonable and novel in design. How to use: After connecting the gas stone, connect to the air pump, which can make the bubble emerge evenly, increase the contact area with water, and increase the amount of dissolved oxygen in aquarium. There are tubes and elasticity, so there are errors such as measurement methods. If you mind, please do not buy Delivered quantity: 1 piece Product specifications: inner diameter 4mm, outer diameter 6mm, length 5 meters Product weight: about 75g