The product is made of colored keratin protein that blends perfectly with existing hair strands to instantly create the appearance of naturally thick and full hair. Ideal for fine hair, these hair fibers conceal hair loss and provide a thicker and fuller look. Simply shake or spray Toppik fibers onto thinning areas for immediate results. Toppik Large Size (27.5g) Medium Brown can be used in two different ways: by applying to needed areas like a salt shaker or using the Hair Fibers Applicator Spray for more precise application.