The Happy Day Pen is a cute and colorful pen! The Happy Day Pen comes with 1 pen of your choice per purchase. Each style name represents the pen color. This is a 0.38mm pen. This pen features fun and colorful patterns on the body of the pens! These adorable pens are great to use for work, or school! Collect them all and take it with you everywhere! Please check out the photos to learn more!