SureFire EP3 Sonic Defender Earplugs 1 Pair Clear Medium NSN 6515-01-549-6453. Permanent hearing loss is no joke. SureFire EP3 Sonic Defenders will protect your hearing against Noise Induced Hearing Loss (NIHL) without compromising your ability to hear routine sounds or conversations in noisy environments. Their double-flanged-stem provides a Noise Reduction Rating (NRR) of 24 dB. Safe sound levels are allowed to pass through into the ear canal while potentially harmful noises (above 85 dB) are reduced via our proprietary noise-reducing filter. EP3s include attached filter caps that can be inserted for additional protection blocking out lower-level noise like that heard on a plane where hearing ambient sounds or conversations isn't critical. Sonic Defenders are made from a soft durable hypoallergenic polymer that provides all-day comfort and extends product life (up to 6+ months depending on usage and care). Specifications for SureFire EP3 Sonic Defender Earplugs: Manufacturer: SureFire Fabric/Material: hypoallergenic polymer NRR: 24 dB Included Accessories: 26" polymer lanyard included Condition: New Features of SureFire EP3 Sonic Defender Earplugs 24-dB Noise Reduction Rating (NRR) with filter caps inserted Lowers potentially dangerous noise levels above 85 dB Hear safe sound levels (with filter caps out) as if you weren't wearing ear plugs Patented EarLock retention rings utilize seven contact points to lock earpieces in place and fit the same way every time; soft double-flanged stems provide secure seals and all-day comfort Made from hypoallergenic medical-grade polymer that's soft durable and long-lasting Low-profile design for comfortable wearing with a mask helmet or hat or while using a phone headphones or supplemental hearing muffs Serve as earpieces for compatible radio communication systems Package Contents: SureFire EP3 Sonic Defender Earplugs SureFire EP3-MPR: EP3 Sonic Defender Earplugs 1 Pair Clear Medium NSN 6515-01-549-6453