Surefire Hearing Protection Comply Canal 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, Comply Canal Tips Provide All-Day Comfort And Help Reduce Irritation And Fatigue In The Ear Canal. Their Elastomeric 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 Ep7'S Stem And Securely Screwing On A New One. Features: - Provide 28Db Nrr When Properly Installed On Ep7S And Used As Directed - Ultra-Soft Memory Foam Delivers All-Day Comfort And Less Irritation And/or Ear Canal Fatigue - Ergonomic Design Features Sleek, Tapered Shape For Deeper Insertion And Acoustic Seal - Body-Heat Activated For Easier Insertion And Secure Fit - Flexible Threaded Core Makes Installation Easy And Secure Specifications: - Size: Medium - Quantity: 3 Pair - Color: Black.