Colour:Dark brown Osking Hair Building Fiber is made of the most naturally occurring plant fiber, Not only is this product safe to use but it can save you hundreds of pounds against expensive hair treatment and medication. Osking Hair Building Fibers are nearly identical to human hair, blending naturally and undetectable. Other Keratin fibers are derived from lower-grade sources like fish bones, nails and hooves, making their texture and appearance lack in comparison to our top most quality.