Made from a soft and flexible synthetic TPR rubber, these protective reusable earplugs have been tested in accordance with ANSI Standard S3.19-1974 and achieved a 27 dB Noise Reduction Rating. The triple sealing flange shape creates a positive seal in the ear canal without creating irritating pressure. Each plug is tethered to the other with a PVC-free polypropylene plastic cord. The bright red color provides improved visibility and helps aid in ensuring workplace compliance. Packaged in pairs, they come in a convenient 100-Pair dispenser box.