The 3M Express Pod Plugs Corded Earplugs provide reliable hearing protection with a Noise Reduction Rating (NRR) of 25 dB, classified as CSA Class AL. These earplugs feature assorted color grips for easy identification and come in a reusable Pillow Pack to keep them clean when not in use. They are also test compatible with the 3M E-A-Rfit Validation System, ensuring effective hearing conservation.