... health, safety, soft silicon / foam anti-noise earplugStudy shows that: the noise would cause people's fatigue, hearing loss ... other negative emotions. More than 100 decibels of noise will have adverse effects on physiological. Fuction: to ... wearing health, safety, soft, comfortable, good sound effects; Packing:OPP bag,plastic box,customer designNameearplugfunctionimprove sleepmaiterialsilliconNRR26db