H7P3E 3M PELTOR OPTIME Description Description Cap-mounted design allows for easy use with most hard hats Liquid/foam filled ear cushions Noise Reduction Rating (NRRA): 24 dB. CSA Class A Related products 3M6001 – 3M™ Organic Vapour Cartridge 3M7500 SERIES HALF MASK RESPIRATOR MAX 1EAR PLUGS NP102C – DYNA-FIT LITE EARPLUGS 100/BX