3M 1100 uncorded foam earplugs feature soft, hypoallergenic foam and a tapered design to fit comfortably in the earcanal. 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.