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. *The NRR may overestimate the hearing protection provided during typical use. 3M recommends reducing the NRR by 50% for estimating the amount of noise reduction provided. 200 pairs per box.