Peltor™ 7000009664 Optime™ 105 Noise Reduction Earmuff, 29 dB Noise Reduction, Black/Red, Behind-the-Neck Band Position, ANSI S3.19-1974, CSA Class AL Peltor™ 7000009664 Optime™ 105 Noise Reduction Earmuff, 29 dB Noise Reduction, Black/Red, Behind-the-Neck Band Position, ANSI S3.19-1974, CSA Class AL