3M EAR[TM] Ultra Fit Earplugs 340-4007 Metal Balls and String 340-4007 1 Pair

Catalog number: 340-4007 Features: ●Contains iron balls, so it reacts to metal detectors. ●Ideal for preventing foreign objects from entering. ●Can be washed and reused. ●Metal detector-reactive earplugs with an NRR rating of 25 dB. Specifications: ●Cord: Yes (620 mm) ●Size: Free ●NRR rating (dB): 25 ●NRR rating: 25 dB ●Sound insulation performance based on ANSI S3.19-1974 Material/Finish: ●Earplug body: Thermoplastic elastomer (TPR) Note: ●This product is not intended for general consumers, so the labels and instruction manuals are not written or included for general consumers.