... pollution treatment 3,wearing health,safety,rebound Ear plug with metal case Hot sale gift 2012 - Fluorescent yellow ... noise effective,SNR:33DB, This earplug can be washed with water, reuse. Name Material Model standard earplugs slowPU ... size:52*42*40.5cms N.W.:6kgs G.W.:7.5kgs Packaging can be customized according ... . So we must observe ear plug and play back the return time,the better the quality. 2 ...