Gerson N95 Particulate Respirator Masks w/valve 10pk Gerson 1740 N95 Particulate Respirator w/Valve (Made in USA) 10 masks/box Premium oversized valve opens more easily to expel hot air for cool comfort. Electrostatically-charged filter media provides low inhalation breathing resistance Latex-free, staple-free head straps for comfort and safety. Soft foam nose cushion More durable, double-shell construction for long life and economy.