Uncorded earplugs are optimized for exceptional in-ear comfort. Four-flange design creates a better seal in your ear canal to deliver optimal protection & increased comfort for long-term wear. Internal fins create an interlocking, noise-blocking barrier within the air pocket, providing dependable attenuation for all wearers upon proper insertion. Firm stem & tapered shape facilitate easy insertion & removal, & allow the earplug to sit comfortably in your ear canal. Earplugs are designed with a Noise Reduction Rating (NRR) of 27.