The universal pens for school children, students and professionals, these fine point pens feature water-based ink, formulated to sustain a long cap-off time. The uniquely-designed, fine point 0.4mm tips are encased in metal, so the pens can be used with rulers and stencils. The caps are ventilated for safety. Details:Black0.4mm tips3 pensDurableWater-based inkLong cap-off time