FLEXIBLE & DURABLE: This professional 3/16" silicone airline tubing is clear, flexible, and durable! Made for use in aquariums, terrariums, and hydroponics systems. MANY USES: Great for use with aquarium ornaments, bubblers, Blue Spotted Air Stone Discs & air stones, and a variety of air driven filters. STANDARD SIZE: Designed to fit all standard outlets, including air pumps, check valves, filtration system, air stones, air flow control levers, and aquarium ornaments. SAFE: Made of silicone. Easily hide and blend into your aquarium, terrarium, or hydroponics system