This design classic needs no introduction: the Bic Cristal Ball Pen has been a common sight in businesses; schools and homes since 1950. It features a durable tungsten carbide ball mechanism and smooth oil-based ink for reliable operation in a range of situations. The medium 1.0mm tip is ideal for general writing and sketching; while the cap and end plug match the colour of the ink for easy identification. This assorted pack of 10 contains blue; black; red and green.