PE Foam OPTIMAL FIT compatible with SMALLER EAR CANALS: Designed specifically compatible with smaller ears, the low density polyurethane foam expands gently in the ear canal to deliver comcompatible withtable long-term wear PROMOTES WORKPLACE HYGIENE: Smooth, soil-resistant closed-cell foam skin prevents dirt build-up to keep ear canals clean and help inhibit ear infections SUPERIOR HEARING PROTECTION: The expanding foam and contoured T-shape provide a secure, noise-blocking fit that delivers a superior Noise Reduction Rating (NRR) of 30 EASY INSERTIONREMOVAL: The earplug's unique T-shape allows compatible with easy gripping between thumb and compatible withefinger compatible with quick, no-fuss insertion and removal RECOMMENDED INDUSTRIES: agriculture, construction, fire, compatible withestry, government, law encompatible withcement, manufacturing, mining, steelmetal, transportation, utilities, welding; 50 pairs of earplugs per pack