Bring color to your doodles and sketches with the CMYK Pen. The CMYK process is used in printing to build up full color images, and now you can use that same process to create full color art with this ballpoint pen. The 4 color ball point pen includes Cyan, Magenta, Yellow and Black to mix and explore a rainbow of hues. With the handy mixing guide included in the packet, you'll be able to find the perfect shade for every project. Let your creativity flow - experiment, doodle, sketch, cross-hatch, and get creative!