Deep Jungle Black Flexible Airline Tubing for Aquariums, Terrariums, and Hydroponics This professional silicone airline tubing is Black, flexible, reliable, and durable! Made for use in hydroponics systems, aquariums, terrariums! Great for use with Blue Spotted Air Stone Discs & air stones, and a variety of air driven filters Easily hide and blend into your hydroponics system, aquarium, terrarium Made of silicone, 50 feet in long Designed to fit all standard outlets, including air pumps, check valves, filtration system, air stones, air flow control levers, and aquarium ornaments.