Extremely long-lasting ink Ink flow has been regulated to avoid blobbing or scratching Ventilated caps in accordance with ISO 11540 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 Medium 1.0mm tip gives line width 0.35mm Black Packed: 10