In-the-ear plugs help prevent hearing damage by blocking potentially dangerous noise from entering the ear canal. Internal Hocks Noise BrakerA(R) blocks sounds above 80dB, but allows attenuated sounds below that level to pass, so your ability to hear conversation is not adversely affected. Made from a soft, comfortable, hypoallergenic medical-grade polymer that's ergonomically shaped for a tight seal and secure fit that won't work loose. Where extra sound isolation is desired, insert attached stopper plugs to block low-level sounds as well. Mfg: Surefire SPECS: Soft polymer. One pair, right and left. Both models available in Medium size (fits most ears).