DuoTip Markers mean twice the colors for double the coloring fun! Our 12 count package has 24 colors to choose from! .All Faber-Castell markers have bright, washable inks made from food-grade vegetable dyes. Markers have long-lasting water-based ink, which allow them to be re-hydrated by placing the nib in water; ventilated safety cap prevents choking; non-toxic & acid free; conforms to ASTM D-4236. Recommended for ages 4 years and older.