Toppik Hair Building Fiber Black 27,5 gToppik Hair Building Fibers in Black (27. 5 g) are cosmetically designed microfibers made mostly of keratin. Their purpose is to instantly give the appearance of thicker, fuller hair by blending with thinning areas and concealing bald spots. This is the larger economy size compared to the smaller 12 g bottles. Key Features & Benefits NaturalKeratin Fibers: The fibers are made of keratin the same type of protein hair is made from which helps the fibers