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Noise reduction rate: 25dB Max frequency attenuation: 42.100 dB at 8000kHz Howard Leight SDT-30 SmartFit® Detectable Ear Plugs, Reusable, Corded, NRR 25, 100 Pairs/Bag Conforming Material Technology™ adapts to the shape of the surrounding ear canal when in your ear, and returns the earplug to its original shape when removed. Delivers superior comfort and a truly individual fit. Simplifies inventory control - a single product can fit almost every wearer. Blue color provides high visibility in detection. Metal ring on stem detectable by automated equipment.