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Hi BC11, Thank you for the question. Unfortunately, NRR is not listed as part of the product specifications. Please note that while they offer good noise-canceling features, they may not provide the level of hearing protection required in an extremely loud environment. It is recommended to use specialized hearing protection earmuffs that are specifically designed to protect against the high decibel levels that are produced by loud machines. These earmuffs often have a higher Noise Reduction Rating (NRR) and are built to handle your specific needs. Regards, -Craig
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