Ear Plugs Uses Tested by US Navy pilots. Drug free. Safe, soft and disposable. Relieves air pressure and reduces harsh noise naturally with the Exclusive CeramX filter. For ages 11 and over. Polyurethane-free. This pack contains one pair of disposable EarPlanes good for one round-trip flight. Also great for mountain driving. Noise Reduction Rating: 20 decibels when used as directed. The range of noise reduction ratings for existing hearing protectors is approximately 0 to 30. (Higher numbers denote greater effetiveness.)Directions Before inserting, pinch nose and blow to clear your ears. For best results, ALWAYS insert EarPlanes one hour BEFORE landing. Remove AFTER landing and when the cabin door is opened. Chronic sufferers may ALSO insert EarPlanes just BEFORE takeoff. EarPlanes may be removed when the airplane reaches MAXIMUM altitude and reinserted one hour BEFORE landing. For maximum results, use your opposite hand to pull the top of your ear upward. Insert the ribbed end and tur