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Earplug classic 311-4101 nrr 33 metal detectable w/metal detectable cord 200 pr/bx 10 bx/case. The 3M E-A-R Classic 311-4101 Metal Detectable Roll-Down Foam Earplugs are made with a stainless-steel ball bearing inside each earplug and metal fibers in the cord, ensuring the earplugs stay in the ear.…