Howard Leight Fusion multiple use, corded earplugs. FlexiFirm stem is easy to grasp while SoftFlange creates a comfortable seal in the ear canal. Nylon cord detaches allowing adapataion of the ear plugs to almost any application. Noise Reduction Rate (NRR) = 27dB. Tested and approved for ANSI S.3.19-1974. 100 pair per box.