Like having six pens on one, the Dr. Seuss 6-Color Pen contains blue, red, orange, black, green, and purple inks in a single barrel. Slide the switch and change colors as you write. Each assortment of 12 pens contains 4 different barrel designs showcasing a different character from Dr. Seuss's The Cat In The Hat™, Horton Hears A Who, And Green Eggs And Ham.