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 Environmentally friendly manufacturing process Reusable box, phthalate-free material Superfine 0.4mm Black Packed: 10 ""Green"" Product relevant details: 30-40% Recycled