PVC Airline Tubing: The aquarium tubing is made of pure PVC material. It is really flexible, durable and scratch-proof. Its thickened design allows for rough handling and repeated use Multipurpose: The aquarium air tubing is ideal for most basic aeration setup. Great for fish tanks, aquariums, hydroponics, ponds, water gardens, siphon systems, laboratories, etc. Standard Airline Tubing: 82 ft. in length and 3/16" in diameter (4 mm in inner diameter & 6 mm in outer diameter). Work great on most common air systems, such as oxygen, CO₂ or other high-pressure systems Kink-Resistant: The wear-resistant aquarium hose can be flexibly twisted without kinking. The smooth interior surface effectively prevents sediment accumulation and allows for smooth air flow Safe & Reusable: The fish tank air tube is safe and reliable to resist cracking, high temperature, corrosion and leakage. Dependable for long-time use Pawfly 82 Feet Aquarium Air Tubing Standard 3/16" Airline Tubing for Fish Tank Air Pump Accessories PVC Hose for Aquarium Garden Terrarium Pond, Black