3M Industrial Safety 370-2000 ARC Uncorded Dual Ended Earplug

Hear-Through design allow workers to hear conversations, signals, or other critical sounds clearly, while helping protect against impulse noise from an arc flash. Double-end versatility. Insert the yellow end - Hear-Through design until arc flash occurs when the calibrated noise filter activates immediately to suppress noise to a safer level. Insert red end for protection against continuous hazardous noise. Tri-flange, push-to-fit design washable and reusable.