Corded for easy short term storage around the neck.3M™ E-A-R™ Classic™ Earplugs set the standard in hearing protection as the world's first foam earplugsSlow recovery, low pressure foam conforms to the shape of the ear canal for enhanced comfort and wearabilityMoisture-resistant—helps maintain a consistent expansion time, even in humid environmentsFlame resistant—important for potential arc flash situations and for storage considerationsNoise reduction rating (NRR) 29 dB. CSA Class AL