... noise effective.SNR33db ,earplug can be washed with water, reuse. Ear plugs box Direction of UseTake out the earplug, with the ... earplug until the earplug swelling shape is competely in the ear.(about last 30s) Production capacityWe have a strong production capacity ... anti-noise earplug swelling suppression the canal skin, can cause ear swelling,earache and other discomfort. Flexibility can not be too ...