Protects hearing by reducing harmful noise. Flents - Quality products since 1927. Noise Reduction Rating: 29 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). Sleep better naturally! Prevent future hearing problems by using proper hearing protection today. Stock No. F408-155. Excellent For: Sleeping; Power tools; Lawn mowing; Car racing; Concerts; Rifle range; Studying. Made in U.S.A.