Permanent pen that can be used on OHP transparencies and 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. Medium 0.8mm. Black permanent ink. Packed: 10.