Howard Leight by Honeywell Earplugs, Detectable, Series: Laser Trak, Corded, 33 dB Noise Reduction Rating, T-Shape, Universal, Blue/Orange Plug, Polyurethane Foam/Brass Plug, Blue Cord, PVC Cord, Specifications Met: ANSI S3.19-1974/S12.6/1997, Z94.2-1994, EN-24869-1:1993, EN 352-2:1993, EU 89/686/EEC, EU 2003/10/EC Z94.2, OSHA 29 CFR 1910.95, NOHSC 1007 2000, ISO 9001:2008, Disposable Disposable/Reusable.Laser Trak safety earplugs offer high visual and metal detectability in a single use earplug. Laser Trak low pressure polyurethane foam expands gently inside the ear canal for comfortable long term wear. A metal grommet on the earplug aids in metal detection, especially in process industries.