... earplug cover 1.CE 2.SNR:33db(P)/27db(S) 3.custom made,option:cord 4.low carbon,environmental protection Silicone earplug ... uniform structure, smooth surface withoutadhesive, noise effective,SNR:33DB, This earplug can be washed with water, reuse. Name Material Model standard ... .Low rebound effectIf it is too flexible, anti-noise earplug swelling suppression the canal skin, can cause ear swelling, ...