Hair Thickening Fibers is made from: Auburn: Keratin, Cetrimonium Chloride, Silica, DMDM Hydantoin, Yellow 5, Red 33.<br><br>Black: Keratin, Cetrimonium Chloride, Silica, DMDM Hydantoin, Yellow 5, Red 33, Blue 1.<br><br>Blond: Keratin, Cetrimonium Chloride, Silica, DMDM Hydantoin, Yellow 5, Yellow 6.<br><br>Dark Brown: Keratin, Cetrimonium Chloride, Silica, DMDM Hydantoin, Yellow 5, Red 33, Blue 1.<br><br>Gray: Keratin, Cetrimonium Chloride, Silica, DMDM Hydantoin, Yellow 5, Red 33, Green 3.<br><br>Light Brown: Keratin, Cetrimonium Chloride, Silica, DMDM Hydantoin, Yellow 5, Yellow 6, Red 33, Blue 1.<br><br>Medium Brown: Keratin, Cetrimonium Chloride, Silica, DMDM Hydantoin, Yellow 5, Yellow 6, Red 33, Blue 1.