Honeywell 3301167 Laser Trak Corded Earplug Laser Trak offers high visual and metal detectability in a single-use earplug. Laser Trak's low-pressure foam expands gently inside the ear canal for comfortable long-term wear, while its contoured T-shape delivers easy handling. A metal grommet on the earplug aids in metal detection, especially in process industries. Foam material.