PE foam OPTIMAL FIT FOR SMALLER EAR CANALS: Specially designed for smaller ears, the low-density polyurethane foam expands gently into the ear canal for comfortable long-term use PROMOTES OCCUPATIONAL HYGIENE: Smooth, dirt-repellent closed-cell foam skin prevents dirt buildup to keep ear canals clean and help prevent ear infections SUPERIOR HEARING PROTECTION: The expanding foam and contoured T-shape provide a secure, noise-canceling fit that delivers a superior Noise Reduction Rating (NRR) of 30 EASY INSERT & REMOVAL: The earplug's unique T-shape allows for easy grip between the thumb and index finger for quick and easy insertion and removal RECOMMENDED INDUSTRIES: agriculture, construction, fire, forestry, government, law enforcement, manufacturing, mining, steel and metal, transportation, utilities, welding; 50 pairs of earplugs per pack