Model 1000 earmuffs are made of durable, lightweight. Nonconductive dielectric plastic and feature soft, foam-filled cushions and large ear cup openings for greater protection and comfort. Pivoting ear cup connection maintains seal and alignment. Three-position headband fits any head size and can be worn over the head, behind the head or under the chin. NRR 20dB. Tested to ANSI S3.19-1974 standard. Sold by the each.