3M™ E-A-R™ ARC Plug™ earplugs feature Hear-Through™ design allow workers to hear conversations, signals, or other critical sounds clearly, while helping protect against impulse noise from an arc flash. Benefits •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 •Material successfully tested for ARC exposures of category 2 and higher, A