These are 3M™ PELTOR Optime™ 105 Earmuffs H10P3E, Hard Hat Attached, NRR 18 dB
For noise levels up to 105 dBA. Easy cap-mount design. Liquid/foam filled earmuff cushions. Noise Reduction Rating (NRR)*: 27dB. CSA Class AL. 3M™ Peltor™ Optime™ 105 cap attached earmuffs feature double-shell technology to provide effective hearing protection.
