E-A-R Muffs Model 2000H Helmet-Mount Earmuffs"At-rest" position reduces contamination. Muffs swing up and out of the way quickly. Works with AO Tuffmaster® face protection system. Model 2000H, Mounts to most hard hats without an adapter. Color: Maroon; Noise Reduction Rate (NRR): 21 dB; Quantity: 24 per case; Weight: 19 lb.