Penn-Plax Deluxe Flexible Silicone Tubing is perfect for all your aquarium airline needs. This tubing is made from a silicone material that stands up to wear and will not crack or become brittle over time. Super soft & flexible, this tubing resists kinking and is safe for both fresh & salt water environments. The light blue color blends in with most environments making it easy to hide. Ideal for aquariums & for applications where flexibility and durability are a must.