The Optime 98 Series is a lightweight, mid-range cap mount earmuff for noise levels up to 98 dBA. It utilizes individual stainless spring steel headband wires and two low-tension points for even, comfortable alignment to the head. The broad foam cushions give low comfortable surface pressure. It also features pressure equalization air openings, which quickly ensure the correct pressure to the eardrum. It is suitable for factories, sheet metal works, schools, printing operations, textile industries, power equipment, etc. Noise Reduction Rating (NRR)*: 23 dB. CSA Class A. ANSI S3.19-1974/CSA Z94.2.Do you order this product often and/or in large quantities? Check out our Large Order Program to save yourself time and money.