3M 1100 Earplugs are uncorded roll down earplugs that have a smooth, dirt resistant surface, made from soft polyurethane foam that is hypoallergenic. They have a tapered design to easily fit in the ear canal.
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.