Every facet of fine line detailing and permanence is incorporated to execute writing in micro-spaces or onto obscure surfaces. The Microperm Pen writes on Diamonds, glass, wood, cellophane, plastic and glossy sheets, CD's, photographic and x-ray film, paper and metal. These pens are chemically stable, waterproof, and will permanently adhere to most surfaces.

The set contains black .25mm, .35mm, and .45mm point sizes.