Hard Hat Mounted Safety Ear Muffs (MMM1450) Category: Earmuffs Ear Cushion Material - Foam-Filled Material(s) - Lightweight Noise Reduction Rate (NRR) [Nom] - 23 dB Post-Consumer Recycled Content Percent [Nom] - 0 % Pre-Consumer Recycled Content Percent [Nom] - 0 %