3M 1435 Optime I Headband Ear Muff Defenders Medium Noise Level Reduction 26d B Ref H510A-401-GU.- High attenuation despite lightness & low profile.- Extremely low profile & light, making it easy to team with other equipment.- Generous inside depth to accommodate the ears for comfort.- Soft & wide sealing rings filled with a unique combination of foam & liquid, providing optimum sealing & low pressure.- Optime I headband ear defenders.- SNR 26d B.- For moderate to high noise attenuation.- Unique band design, stainless steel wire for constant pressure over long periods of use.