Hairology Natural Keratin Hair Thickening Fibers volumizes fine, thinning hair and conceals scalp. Using natural fibers with oat protein to help thicken and add luster, Hairology blends beautifully to instantly conceal thinning hair. Easy 2-step process--first, spray on the hair thickening fibers; then use the hair fiber holding spray.( SETTING SPRAY IS SOLD SEPARATELY) 1 x Hairology Natural Keratin Hair Thickening Fibers ( Light to Medium Gray) Measurements: Hair fibers, .19 oz.