UNIQUE DUAL-MATERIAL CONSTRUCTION: Fusion Reusable Earplugs' patented dual material design combines to deliver superior comfort and easy handling FIRM INNER CORE: FlexiFirm core and stem ensure easy insertion into the ear canal for a superior fit all day ear protection SOFT OUTER FLANGES: Fusion’s patented SoftFlange design adjusts easily to the ear canal to deliver unmatched comfort and superior hearing protection DETACHABLE CORD & CASE: Unique detachable nylon cord system adapts to virtually any work application; HearPack storage case keeps earplugs clean and helps prevent loss or misplacement SUPERIOR NRR 27: Flanged outer design and firm inner core combine to deliver superior ear safety and a Noise Reduction Rating of 27; 100 pairs per pack