PE foam - Optimal fit for narrow ear canals: Specially designed for small ears, the low-density polyurethane foam gently expands in the ear canal for optimal comfort, even with prolonged use. Promotes workplace hygiene: The smooth, dirt-repellent, closed-cell foam surface prevents dirt accumulation, keeping ear canals clean and helping to prevent ear infections. Superior hearing protection: The expanding foam and contoured T-shape ensure a secure fit and effective noise attenuation, providing a superior Noise Reduction Rating (NRR) of 30 dB. Easy insertion and removal: The earplug's unique T-shape allows for easy grip between the thumb and forefinger for quick and easy insertion and removal. Recommended areas of use: agriculture, construction, firefighting, forestry, public administration, law enforcement, manufacturing, mining, steel production, transportation, utilities, welding. 50 pairs of earplugs per pack.