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Lightweight ear muff is designed for protection against industrial noise and other loud sounds up to a maximum of 112 decibels. Noise Reduction Rating (NRR) is 27 decibels. Electrically insulated (dielectric), wire headband offers consistent pressure. Earcup pivot points tilt for optimum comfort. Design of the Peltor X4A ear muff also features replaceable ear cushions and foam liners.