Yamato Silky Twister Colorix CLST-12 - Watercolor Crayons 12 Vivid Colors In Durable Case TWISTABLE BARREL KEEPS YOUR HANDS CLEAN : Twist the barrel and let out the core. 3 WAYS OF COLORING : Crayons, pastel and watercolor. Add a dab of water with a paint brush. BEST FOR KIDS AND ELDERLY PEOPLE : Easy and smooth coloring with a little pen pressure. 3.5 IN CORE LENGTH : Enjoy your coloring for a long time.