These 3M reusable corded ear plugs are made from soft monoprene & feature a unique outer flange design to help keep the plug in place for increased wearer comfort. A new finger grip design improves the ease of insertion into the ear & the polyester cord helps to prevent loss. These ear plugs conform to EN352-2:1993. Attenuation: SNR=25d B, H=27d B, M=22d B, L=20d B Corded ear plugs made with monoprene Soft formulation for added comfort Unique outer flange design helps keep the ear plug in place Polyester cord helps prevent loss Conforms to EN352-2:1993 Attenuation: SNR=25d B, H=27d B, M=22d B, L=20d B