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Berkowits Hair Building fibers are also made of 100% natural keratin protein, used as an instant solution for thickening hair. Hair Building Fibers(Berkowits) are the perfect way to add volume and thickness to your hair in just 30 seconds. Our revolutionary hair building fibers are made from high quality, 100% natural keratin; a fibrous protein found in hair strands. They merge perfectly with your own hair using electrostatic charge to give instant, natural and durable hair thickness which lasts all day. We're so confident you'll have a great experience with our hair building fibers, we offer a full 30-day Challange. Key Features: Instant natural looking volume. Made from 100% natural keratin. With Kinetic technology, fibers bind 400% stronger than others*. Available in Black and Dark brown Featuring color lock technology. WHAT IT DOES Instantly fills in thinning areas Conceals hair loss Added density Give you thicker and fuller hair look Undetectable matching hair Color.