HOWARD LEIGHT LT-30 TRAK EARPLUGS NRR 33 CORDED 1000 PAIRS/ CASE BRILLIANTLY COLORED PLUGS FEATURE A NONFERROUS METAL GROMMET ENSURING EXCELLENT VISUAL AND METAL-SCAN DETECTABILITY. THE TRAK LINE IS PARTICULARLY USEFUL IN PROCESS INDUSTRIES EMPLOYING AUTOMATED INSPECTION TECHNOLOGY. LOW-PRESSURE POLYURETHANE FOAM GENTLY EXPANDS TO FIT THE WEARER'S EAR CANAL. CONTOURED T SHAPE SIMPLIFIES INSERTION AND REMOVAL. CORDED. NOISE REDUCTION RATE (NRR) 32 DB.