Ll-1 D Laser Lite Single-use Earplugs, Cordless, 32nrr, Ma-yw, Ls500, 500 PairsVibrant coloring keeps your protection highly visible, enabling easy compliance sighting. Self adjusting polyurethane foam expands upon insertion, ensuring a tight yet comfortable ear canal seal. Smooth, soil resistant closed cell foam skin prevents dirt buildup. Contoured shape fits to a T. Leight Source 500 Refill. Corded Cordless: Cordless; Shape: T; Material(s): Polyurethane Foam; Noise Reduction Rate (NRR): 32 dB.