Gel Ink Ballpoint Cap Pen 10 Colour SetA set of 10 Gel Ink Ballpoint Cap Pens. Includes red, orange, lime green, green, light blue, blue, purple, pink, navy, and black. Comes in either 0. 38 mm or 0. 5 mm. Our top rated pen features a special tip mechanism that prevents ink from drying out. Its water based ink allows for smooth writing and no bleeding through paper. The wide variety of colors makes this pen a staple for stationery lovers.