The H9 Series is a lightweight, mid-range earmuff. 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.