Rainbow Writer Pens are an easy way to colour-code and write creative messages! Each pen comes with six colours: Black, Blue, Red, Green, Purple, and Pink. Change colours with a simple click of a button! The barrel of each pen features a unique design just as colourful as the ink, with a coordinating coloured top, clip, and tip. Each pen measures approximately 5-1/2” long with a 3/5” diameter.