Hair Building Fibers - Medium Brown - Toppik Hair Building Fibers, made of colored keratin blend undetectably with existing hair to instantly create the appearance of naturally thick, full hair.BenefitsSafe, 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 hairMedium Brown colorElectro-statically charged to - Hair Building Fibers - Medium Brown