Each “Rainbow” gel ink pen has 6 different fluorescent colors – pink, orange, blue, green, purple and yellow – so you can watch the colors change as you design. The awesome thing is that each pen has the inks in a different order, so you always have 6 colors to choose from! The pens have gel ink that is free of acid and resists fading, making them perfect for crafts, art schoolwork and albums. Or combine them with the awesome Tiger Tribe painting sets . Gel ink pens are non-toxic and water soluble. Contains 6 pens. Suitable for ages 3 and up.