Sakura IDenti-Pen is a dual point permanent ink marking pen. The durable, extra fine plastic point is perfect for detail work. The medium, fiber point is excellent for larger projects. Excellent for use on metal, glass, ceramics, rubber, wood, photographs and virtually any surface. Quick drying, waterproof ink is indelible on porous surfaces (not for use on fabric). Low odor, xylene-free solvent. Black.