3M foam earplugs, uncorded, 1100, 200 pairs 3M 1100 uncorded foam earplugs feature soft, hypoallergenic foam and a tapered design to fit comfortably in the ear canal. Soft, uncorded foam earplugs that conform to the unique shape of each ear for excellent hearing protection and comfort. Smooth, dirt-resistant surface for hygiene. Comfortable for a wide range of earcanal sizes. Noise reduction rating nrr*: 29 db. Csa class al..