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VP311-1115. Corded, Vending Pack,. Assorted Grips. E-A-R Express Pod Plugs . Reusable Earplugs. Product #. Abbreviated Description. NRR. 340- 6002. Classic earplugs were the industrys first foam earplug virtually revolutionizing hearing protection. Today, the revolution continues. The Classic product line has. reduction than indicated than indicated by the NRR due to variation in earplug fit, and wearing time. It is recommended that the NRR be reduced by 50% for. 10 seconds until the plug expands to seal the ear . Here is the disposable ear plug properly positioned in the ear canal. Fitting Instructions for. 3M Hearing 3M Reusable Ear Plug 1270/1271 is a multi-flanged corded ear plug that provides a convenient, reusable solution for relief from noise in environments where