These Moldex 6770 dual mode ear plugs feature the first flip to listen design which allows wearers to switch to listening without needing to remove and refit the ear plugs. The Flip to Listen Ear Plugs are rated NRR 24 to protect in noisy areas. When flipped open they are rated at NRR 4 to allow for listening. Each pair of ear plugs comes with a Pocket-Pak carrying case which provides for hygienic storage during breaks. The carrying case saves on cost by preventing ear plugs from being misplaced.