With case. Noise reduction rating: 21 decibels. Silicone ear plugs. Conforms to seal out water and keep ears dry. Protechs Ear Plugs help to seal out water when worn properly. Great for swimming. Noise Reduction Rating: 21 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). Questions? 1-800-328-2742. Made in USA.