3M™ PELTOR™ Optime™ II Neckband Format Earmuff H520B, Green, Class 5 SLC80 27dB 3M™ PELTOR™ Optime™ II Earmuffs, H520B have been developed for demanding noise-hazard environments. A suitable choice for environments with substantial industrial noise or construction machinery, like airports and agricultural work. Reduces noise levels up to 27 dB Soft, wide, cushions help reduce pressure around the ears Large space inside the cups helps minimise heat and moisture build-up Cushions and inserts available as replacement Hygiene Kits