Hair Building Fibers - Dark Brown - Toppik Hair Building Fibers, made of colored keratin blend undetectably with existing hair to instantly create the appearance of naturally thick, full hair.BenefitsMade from pure organic Keratin Protein; the same protein found in human hairDark Brown colorElectro-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 secondsSafe, natural, and undetectable way to improve the appearance of thinning hair without harmful drugs, chemicals, or surgerySecure 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