3M Classic Uncorded Earplugs are made of PVC foam that offers comfort with low pressure and is an ergonomically, reliable choice in hearing protection. Earplugs have a cylindrical shape that protects better than tapered plugs. The yellow color offers high visibility and the moisture resistant foam is flame retardant which is critical for storage. It adjusts to the shape of the ear canal while generating a snug noise barrier and the noise reduction is rated at 33 dB. The earplugs come in a poly bag that keeps the earplugs clean before use.