Relieves Air Pressure Discomfort Noise Reduction Rating of 20 2 For Ages 11 Up 3 Hypo-Allergenic 4 Latex Free This package contains one pair of disposable ear plugs good for one round-trip flight. Also great for mountain driving. Relieves air pressure discomfort. The range of noise reduction rating for existing hearing protectors is approximately 0 to 30. Higher numbers denote greater effectiveness.