bullet Unfading EAR PLUG 1,CE,SNR:33db ... structure, smooth surface withoutadhesive, noise effective,SNR:33DB, This earplug can be washed with water, reuse. Name Material Model ... according to customer requirements Direction of UseTake out the earplug, with the index finger and thumb to rub ... rebound effectIf it is too flexible, anti-noise earplug swelling suppression the canal skin, can cause ear swelling ...