The QUATTRO EP-401 is our most popular reusable un-corded ear plug that's designed for long term repeated use with easy handling. Made in the USA. • Ultra-Soft Polymer is Non-Allergenic & Non-Irritating• Resists ear wax and body oils• Four-Flange Rounded Design Creates an Effective Seal• Sturdy Stem is Easy to Grip for Insertion & Removal• 25 NRR (Noise Reduction Rating). • 36 SNR CE EN-352-2:2002• Tested to ANSI S3.19-1974• NSN (Nat'l Stock No.) 6515 01 492 0443• Color: Blue• 1 Box has 100 pairs.