3M Peltor Optime II H520A-407-GQ Headband Ear Defenders
Conforms to EN 352-1. Provides protection to SNR 31. H=34 M=29 L=20. Developed for demanding noise-hazard environments and muffles even extremely low frequencies to a maximum degree. The sealing rings, filled with a unique combination of liquid and foam results in an optimum seal with low pressure contact providing snug comfort even over long-time use.