The surefire ep4 sonic defenders plus protect your hearing without interfering with your ability to hear routine sounds or conversations.Their triple-flanged stem design fits larger ear canals and provides a noise reduction rating (nrr) of 24db.Sounds at safe levels are allowed to pass through into the ear canal while potentially harmful noises (above 85db) are reduced via a proprietary design that incorporates a special noise-reducing filter.Ep4s include attached filter caps which can be inserted for additional protection and blocking out lower-level noise like that heard on a plane where hearing ambient sounds or conversations isn't critical.Right/left color-coded sonic defenders plus are made from a soft but durable hypoallergenic polymer that provides all-day comfort and an extended product life (up to 6+ months depending on usage and care)..Type: EarplugsColor: Clear Ear Buds w/Black Ear PieceNrr: 24 dBQuantity: 1 PairStyle: EarbudsMaterial: Polymer