SureFire EP9 Sonic Defenders Cobalt Max Full-Block Metal Detectable Earplugs, triple flanged design, reusable 26dB Noise Reduction Rating (NRR), Full-block design, Metal Detectable Soft, adjustable, triple-flanged stems provide secure seals in ear canals and all-day comfort Low-profile design allows you to keep them in place while wearing a mask, helmet, hat, or while using supplemental hearing muffs Patented EarLock retention rings utilize seven contact points to lock earpieces in place and fit the same way every time Made in USA from hypoallergenic, medical-grade polymer that's soft, durable, and long-lasting