Our Beard Filler Pen will give your beard, Mustache or eyebrows a cleaner and more fuller appearance. This water resistant pen filler is designed to reduce the appearance of gaps in your beard, mustache, and eyebrows. Designed with a four fork tip head for a more seamless natural look. Just fill the gap in the direction of the hair growth and continue to color inside evenly along desired shape. As you apply the product, brush over the application with the brush to blend the color with your natural hair.