Extreme Performance Ear Muff H10A For noise levels up to 105 dBA. Over-the-head earmuffs feature double-shell technology to provide effective hearing protection. Stainless steel headband distributes weight for low-pressure fit. Earcup pivot points that tilt for optimum comfort and efficiency. Material(s): Foam; Plastic; Ear Cushion Material: Foam-Filled; Noise Reduction Rate (NRR): 30 dB; For Use With: Extreme Performance Ear Muff H10A CBTHY10.