Proprietary, premolded, triple-flange design fits comfortably in most ear canals. The soft polymer is washable and reusable, reducing both waste and costs. There is no need to roll earplugsbefore fitting so 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. Blue plug with blue cord. NRR: 25 dB. 100 pair/box; 4 boxes/case.