Micro perm pen featuring 0.25 mm micro-point is perfect for artists, teachers and drafters. Permanent ink pen draws on most non-porous surfaces like metal, glass, plastic, film, wood and cellophane. Pen in micro-point line widths designed for superior precision renders crisp, fine and black lines. Non-toxic, alcohol-based, low-odor ink doesn't dry up when the cap is left off. Hard plastic tip that is good for drawing with ruler or template is protected by metal sleeve. Note: Alcohol based cleaners will remove Microperm ink from non-porous surfaces Crafts Test tubes, beakers and x-rays Photographic film Labels for cans and jars Engineering templates and rulers Back of photographs Protected tips will not split Waterproof and permanent on most surfaces Writes on glossy and coated surfaces Low odor, chemically stable, and waterproof on porous paper substrates Not recommended for use on fabrics intended to be washed and not evaluated for cosmetic use on skin Alcohol based cleaners will remove ink from non-porous surfaces Meets ACMI non-toxicity standards