Hair Building Fibers - Dark Brown - BenefitsDark Brown colorSafe, natural, and undetectable way to improve the appearance of thinning hair without harmful drugs, chemicals, or surgeryMade from pure organic Keratin Protein; the same protein found in human hairElectro-statically charged to form a magnetic attraction with your existing hair - however thin - and blend perfectly to conceal the appearance of thinning and balding in secondsSecure bond stays put all day (and night) even in rain, wind, and perspiration. It won't come off until you wash it out-Toppik Hair Fibers - Dark Brown