Ear Plugs SONIC DEFENDER - Large One Pair EP3 Sonic Defenders® Filtered Flanged Earplugs protect your hearing without interfering with your ability to hear routine sounds or conversations. Their double-flanged-stem design fits most people 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. EP3s include attached filter caps, which can be inserted for additional protection and blocking out lower-level noise. Available in Small, Medium, and Large. Size Medium fits most people. Click on "Images/Articles" tab above for sizing information.