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3M™ Peltor™ Optime™ 101 cap-mounted earmuffs feature a stainless steel headband for consistent force and effective hearing protection. For noise levels up to 101 dBA, these cap-mount earmuffs provide effective hearing protection. Cap-mounted design allows for easy use with most hard hats. Liquid/foam filled ear cushions. Noise Reduction Rating (NRR)*: 24 dB. CSA Class A. *The NRR may overestimate the hearing protection provided during typical use. 3M recommends reducing the NRR by 50% for estimating the amount of noise reduction provided.