Pentel Arts Brush Tip Sign Pens - Yellow - Slightly flexible brush-like pen tip. Water-based Dye inks that are vibrant & intense; Tip can be diluted with water to get a full range of values. Tips are wear-resistant & pressure sensitive; Perfect for graphics, illustrations & scrapbooks. Great for a variety of techniques, including feathering, cross hatching, outlining, calligraphy and detailed line work