DecoColor Extra-Fine Paint Markers are great for writing and detail drawings on glass, paper, wood, clay, porcelain, stone, metal and mirrors. The paint is opaque and xylene-based, as well as acid free, lightfast, weatherproof and pigmented. Suitable for crafting, home and office use!Specifications: acid-free, lightfast, oil-based, pigmented ink, weatherproof, extra fine point, covers most non-coated surfaces, conforms to ASTM D4236.