Set includes following colors : Pink, Orange, Yellow, Green and Blue. Because of the transparent window in the pen tip, you can see the characters and can draw lines only in a place to be Checked without protruding. Also this pen uses a newly developed " quick dry ink". the ink has excellent quick-drying and fixability, drying time is one-third of the conventional ink. Since dries quickly even in glossy paper, not Dirty hands or paper. Plus, it is a combo highlighter that has a broad and fine tip - 4.0 mm and 0.6 mm highlighter in one!