SureFireHearing Protection ComplyCanal Tips are the official replacements for the disposable memory-foam tips used by EP7 Sonic Defenders Ultra earplugs. When installed correctly and worn as directed, these body-heat-activated foam tips, tapered for deeper insertion, conform to your ear canal and maintain an acoustic seal, providing a Noise Reduction Rating (NRR) of 28dB.* Constructed of ultra-soft polyurethane foam, ComplyCanal Tips provide all-day comfort and help reduce irritation and fatigue in the ear canal. Their elastometric cores feature molded-in threading that makes tip replacement (recommended every 2-4 weeks or when soiled) simply a matter of unscrewing the old tip from the EP7s stem and securely screwing on a new one. ComplyCanal Tips are available in 3-pair packs or bulk packaging containing 25 individually packed pairs. They come in three sizessmall, medium, and largewhich fit correspondingly sized EP7s. Order small tips for small EP7s, mediums for medium EP7s