Mack's Slim Fit Shooting Earplugs offer the same great protection as our standard sized earplugs, but are designed with a slightly smaller diameter, providing comfort to those with smaller ear canals. Molded with super low-pressure, skinned and tapered foam to provide unmatched comfort and improved hygiene. Slim Fit carries a noise reduction rating (NRR) of 29 decibels protecting your hearing during hunting, tactical training, target shooting, skeet and trap shooting, motor sports and loud events. Mack's premium aluminum travel case is included for on-the-go convenience. Attach to your keys or backpack so you never get caught without your Mack's Ear Plugs again! The case stores one pair of Mack's earplugs and the screw-on cap with rubber seal helps keep the earplugs clean and protected. Mack's is the #1 Doctor Recommended Brand to prevent hearing loss and has the North American Hunting Club Field Tested Seal of Approval. McKeon Products is an ISO 9001:2008 quality certified company committed to supplying the highest quality, innovative consumer products for hunters and shooters. 100% satisfaction guaranteed!