Elite Silicone Airline Tubing is blue airline tubing that doesn't crack or become brittle over time like regular airline tubing. It is super-soft, very flexible, and will not harden or kink. Ideal for use with air pumps, decorations and more. 3/16" diameter standard silicone airline tubing Soft and pliable airline tubing for easy installation Will not crack, kink, harden or become brittle