Relieves air pressure discomfort with the exclusive CeramX filter. Reduces harsh noise. Drug free. Worlds #1 seller. Tested by U.S. Navy Pilots. Approved by flight attendants. Safe, comfortable, disposable. Soft hypoallergenic, latex-free silicon. 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 effectiveness.)