E-A-R Push-Ins corded earplugs provide extended hearing comfort, convenience and protection. One size fits most. Constructed of 3M E-A-Rform foam, these earplugs feature a no roll-down design and a blue stem for a quick, easy fit. Blue stem helps keep the tips clean when the wearer's hands are dirty. Poly bag keeps each pair of earplugs clean before use. Push-to-fit foam is made of polyurethane. Cord is made of vinyl. Noise Reduction Rating (NRR) is 28 decibels CSA Class AL. Corded earplugs are test-compatible with 3M E-A-Rfit Validation System.