Noise Reduction Rating - NRR 33Smooth, Tapered Foam for a Soft, Comfortable Fit Find the quiet you need anytime, anywhere with Flents Quiet Time Soft Comfort Ear Plugs with carrying case. Take these comfortable ear plugs anywhere to ensure you find silence for studying, focusing, taking a nap, or general noise reduction when working or traveling. The Quiet Time Soft Comfort Ear Plugs are the versatile, go-anywhere ear plug you need, with a tapered form for a more comfortable fit. Protect your ears against hearing loss. Information required by EPA: The level of noise entering a person's ear, when a hearing protector is worn as directed, is closely approximated by the difference between the A-weighted environmental noise level and the NRR. Example: The environmental noise level as measured at the ear is 92 dBA.The NRR is 33 decibels (dB).The level of noise entering the ear is approximately equal to [92 dB(A) - 33] 59 dB(A). For noise environments dominated by frequencies below 500 Hz the C-weighted environmental noise level should be used. Improper fit of this device will reduce its effectiveness in attenuating noise. Consult the enclosed instructions for proper fit. Although hearing protectors can be recommended for protection against the harmful effects of impulsive noise, the Noise Reduction Rating (NRR) is based on the attenuation of continuous noise and may not be an accurate indicator of the protection attainable against impulsive noise such as gunfire. The range of noise reduction ratings for existing hearing protectors is approximately 0 to 30 (higher numbers denote greater effectiveness). Noise Reduction Rating: 33 Decibels (when used as directed).