Marker pens for every situation: Wide fibre-tips are available for large color surfaces, while thin tips are available for drawing fine lines and accentuating details. Duo-Tip Markers mean twice the colors for double the coloring fun! All Faber-Castel® markers have bright, washable inks for easy clean up. These markers have long-lasting, water-based ink which allows them to be re-hydrated by placing the nib in water. The markers have a ventilated safety cap that prevents choking. Non-toxic - conforms to ASTM D-4236.