Mack's® SafeSound® Soft Foam Earplugs. #1 doctor recommended brand. Original. For maximum comfort. Bonus travel case. 10 pair. NRR 32 dB. Sleep, study, work, power tools, shooting sports, travel, loud events, etc. Recyclable package. Extreme softness. Noise reduction rating. 32 decibels (when used as directed). The range of noise reduction ratings for existing hearing protectors is approximately 0 to 30 (high numbers denote greater effectiveness). The level of noise entering a person's ear, when hearing protector is worn as directed, is closely approximated by the difference between the A-weighted environmental noise level and the NRR. Example: 1. The environmental noise level as measured at the ear is 100 dB (A). 2. The NRR is 32 decibels (dB). 3. The level of noise entering the ear is approximately equal to 68 dB (A). (586) 427-7560. www.macksearplugs.com. ©2010 McKeon Products.