Description Earmuffs recommended for TWA noise exposures up to 101 dBA Stainless steel headband distributes weight for low pressure fit Earcup pivot points tilt for comfort that adjusts to individual wearers Noise Reduction Rating (NRR) 27 decibels. CSA Class A Earcups with liquid and foam filled cushions offer comfort for long wear and optimum seal 3M™ Peltor™ Optime™ 101 over-the-head earmuffs feature a stainless steel headband for consistent force and effective hearing protection.