Duo-Tip Markers mean twice the colors for double the coloring fun They feature wide fibre-tips for large color surfaces as well as thin tips for drawing fine lines and accentuating details. All Faber-Castell 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. They are non-toxic -and conform to ASTM D-4236. This Duo-Tip markers set includes 12 markers featuring 24 colors: raspberry, emerald, orange, forest, yellow, pink, mint, sepia, green, cherry, ocean, purple, denim, blush, cobalt, gray, lavender, turquoise, nut, peach, dove, plum, black and lemon. Recommended for ages 4 and up.