Pentel Arts Aquash – Water Brush - Medium Tip. The durable, nylon bristles of this self-wetting brush hold a point and can create broad strokes to fine lines. The soft easy-to-squeeze barrel is comfortable to hold and it contains the water needed to create a beautiful painting. It can be used with Inks, watercolor crayons, markers, watercolor pencils and traditional watercolors to smooth and spread color, and create an array of dramatic effects.