... carbon,environmental protection,Safety,fastness X-MAS fastness fluorescein earplug promotional giftBest price earplugs from Fuyang Handy Plastic Co ... structure, smooth surface withoutadhesive, noise effective,SNR:33DB, This earplug can be washed with water, reuse. Name Material Model ... rebound effectIf it is too flexible, anti-noise earplug swelling suppression the canal skin, can cause ear swelling ...