KINGART PRO Extra Fine Acrylic Paint Pens, 6-piece set - 3 Black and 3 White. Extra fine .07mm tip for precise dots, ultra-fine lines and filling small areas, ideal for outlining, highlights and shading. Water-based, non-toxic acrylic ink works on paper, metal, plastic, glass, rocks, concrete and more, suitable for indoor and outdoor projects. Lightweight and portable, these markers are great for rock painting, detailed illustrations, crafts, personalization and mixed-media work. About KINGART: founded to support creative expression and deliver quality art tools for hobbyists and professionals alike.