Stabilo OHPen Universal Permanent Pens, 0.4 mm (Superfine Tip) - 4 Color Set PRESENT WITH CONFIDENCE - Great presentation tools that will not smudge important slides or transparencies. VERSATILE - They will also write on almost any hard surface, so are perfect for any task you would normally need a marker for. PERMANENT AND NONPERMANENT - A choice of either water soluble or permanent ink to choose from in each color (black shaft indicates permanent ink, gray shaft indicates non-permanent, water-soluble) 	LONG LASTING - A cap-off time of up to 3 days SET OF FOUR COLORS - Includes the color black, red, blue, and green in superfine (.4mm) tip. Non-slip grip zone and practical clip - cap-off time up to 3 days