Tom Bull Hair Building Fibers Refill Pack (50g - Black) is designed to instantly conceal thinning hair, bald spots, and uneven areas, giving you a fuller, thicker appearance in just seconds. This premium refill pack is compatible with popular hair fiber brands like Caboki and Toppik, making it easy to replenish your supply. Crafted from natural keratin fibers, it blends seamlessly with black hair, providing a natural, undetectable look. The fibers are resistant to wind, rain, and sweat, ensuring all-day hold without clumping or flaking. Safe, non-toxic, and free from harmful chemicals, it’s perfect for daily use by both men and women.