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Full-block design provides 26dB Noise Reduction Rating (NRR) to minimize potentially harmful sounds. Lowers potentially dangerous noise levels above 85dB. Soft, adjustable, triple-flanged stem provides secure seal in ear canal and all-day comfort. Made from soft but durable hypoallergenic medical-grade polymer. EarLock retention ring utilizes seven contact points to lock earpiece in place and fits the same way every time. Low-profile design allows you to keep them in place while wearing a mask, helmet, hat, or while using supplemental hearing muffs. 26 inch polymer lanyard included.