3M Classic Uncorded Earplugs are made of PVC foam that offer comfort with low pressure and is an ergonomically, reliable choice in hearing protection. Earplugs have a cylindrical shape that protects better than tapered plugs and the re-usable pillow pack keeps the earplugs clean when not in use. 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 and generates a snug noise barrier. The noise reduction is rated at 29 d.