Proprietary, premolded, triple-flange design fits comfortably in most ear canals. Soft polymer is washable and reusable, reducing both waste and costs. No need to roll ear plugs before fittingso the tips can stay clean even if hands are dirty. Features a stainless steel ball bearing in the plug and metal particles in the cord. NRR 25dB. 100 pair/box; 4 boxes/case.