Pure PVC Tubing: The airline 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 pond tubing is ideal for most basic aeration and water circulation setup. Great for fish tanks, aquariums, hydroponics, siphon systems, laboratories, ponds, water gardens, waterfalls, statuary, etc. Standard Size: 9.8 ft. in length, 1/2" (12 mm) in inner diameter and 1/2" (16 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 hose can be flexibly twisted without kinking. The smooth interior surface effectively prevents sediment accumulation and allows for smooth air or water flow. Safe & Reusable: The PVC tubing is safe and reliable to resist cracking, high temperature, corrosion and leakage. Dependable for long-time use. Pawfly 9.8 Feet Aquarium Airline Tubing, ID 1/2" Clear PVC Flexible Plastic Tube for Aquarium Garden Pond Fountain