These are the same pens that come with Tormek sets and are great for writing the tool jig settings on. They work on a variety of materials like metal, Plastic, stone, wood, styrofoam, glass and film. I use these pens in my workshop all the time.
 
Lumocolor guarantees professional and effective presentation on all overhead transparencies. Not just an OHP pen, can be used on most other glossy surfaces. Ventilated caps in accordance with ISO 11540.
 
Refillable. Barrel and cap made from PP for long service life and low environmental impact. No toxic heavy metals such as cadmium or lead-based colouring agents are used for the colouring of plastic. STAEDTLER does not use xylene and toluene as ink ingredients.
 
Dry Safe ink increases product life span. Environmentally friendly manufacturing process. Reusable box, phthalate-free material. Fine 0.6mm. Black permanent ink.