Howard Leight by Honeywell SmartFit Corded Earplugs feature a patented conforming material technology that makes use of the body temperature to conform to each ear canal. It simplifies inventory control and provides superior comfort. The detachable bright blue color cord can be detected by visual or automated methods and can be used in food processing, automotive, aviation, building construction, general contractor, landscaping and more. The noise reduction is rated at 25 dB and the plugs come in a storage case.