Use your EP7 Sonic Defenders Ultra earplugs longer with reduced ear fatigue with this 3-pack of large Comply Canal Replacement Tips for EP7 Sonic Defender Ultra Earplugs from SureFire. Made of soft polyurethane memory foam, the tips are body-heat activated and conform to your ear canal to maintain an acoustic seal. When inserted properly, they can provide up to 28 dB of NRR when the EP7's stopper is inserted into Hock's Noise Braker filter, available separately.