DuoTip Markers mean twice the colors for double the coloring fun! All Faber-Castell Markers have bright, washable inks made from food-grade dyes. The long lasting non-toxic, acid-free, water-based ink allows them to be re-hydrated by placing the nib in water. The ventilated safety caps prevent choking. Available in Sets of 12 and 24. For ages 4+