6100 Style: Noise Reduction Rate (NRR) 29 dB, Price Each M1 Premium Earmuff M2 Multi-Position Earmuff This item features: -Black-chrome, spring steel headband resists fatigue and is more durable. -Exclusive iridescent color and curvy shape for great looks. -Six different adjustment points provide a custom and comfortable fit for most head sizes. -SoftCoat covering on cups and yoke helps muffle sound transmission. -Headband made of lightweight plastic for comfort all shift long. -Special grips molded into the cups make Fitting Instructions and alignment quick and easy. -Can be locked in the standby position for storage. -SoftCoat covering on cups helps muffle transmitted noise. -The cup adjustment is infinitely variable, distributing pressure evenly for a custom fit. -The lightweight plastic arms slot easily into any hard hat. -The special molded grips make fitting and alignment quick and easy. -Color: Exclusive Iridescent Color. -Style: Noise Reduction Rate (NRR):24 dB, Mounting:Cap - Price is for Each. Testing and approvals: -ANSI S3.19-1974.