The Penn Plax Airline Tubing for Aquariums is the solution for all your aquarium airline needs. It is designed and tested to be safe for salt and freshwater aquatic environments. Standard size 3/16 inch diameter tubing comes and is 8 feet long. It is made from ultra clear, durable plastic that is not only very flexible, but virtually disappears when in water. The Penn Plax Airline Tubing blends in with your aquatic scene so your aquarium ornaments and décor can stand out. The non-toxic plastic tubing is safe for all fish. It is also resistant to kinking so can bend and maneuver the airline tube and it will perform as designed. Say goodbye to having to constantly replace cheap, broken airline tubing when you purchase the Penn Plax Standard Size Airline Tubing!