Python Professional Quality Airline TubingMade of non toxic, ozone safe, FDA approved material, Python Professional Quality Airline Tubing features a pale blue color that is easy to conceal and makes the tubing virtually invisible in your aquarium. Unlike inferior tubing products, Python Air Tubing will never crack or yellow. Non toxic, FDA approved, ozone safe, flexible material will never crack or yellow Pale blue color is easy to conceal and virtually invisible in the aquarium Fits all