PE FoamOPTIMAL FIT FOR SMALLER EAR CANALS: Designed specifically for smaller ears, the low density polyurethane foam expands gently in the ear canal to deliver comfortable long-term wearPROMOTES WORKPLACE HYGIENE: Smooth, soil-resistant closed-cell foam skin prevents dirt build-up to keep ear canals clean and help inhibit ear infectionsSUPERIOR HEARING PROTECTION: The expanding foam and contoured T-shape provide a secure, noise-blocking fit that delivers a superior Noise Reduction Rating (NRR) of 30EASY INSERTION & REMOVAL: The earplug& 39;s unique T-shape allows for easy gripping between thumb and forefinger for quick, no-fuss insertion and removalRECOMMENDED INDUSTRIES: agriculture, construction, fire, forestry, government, law enforcement, manufacturing, mining, steel & metal, transportation, utilities, welding; 50 pairs of earplugs per pack",