Basic Sway Combi Duo Pen With Two Easily Interchangeable Tips Thanks To Its Rotating System. 2 Double-Ended Ballpoint Pens With 4 Ink Colors Available (Body The Same Color As The Ink). The Complete Range Allows Up To 25 Different Combinations. Approximate Writing Length Of 650 Meters. 1Mm Tip. Original Design Created By The Milan R&D Department. Pen Measures: 13.7 X 1.7 Cm. 1.2 Cm √Ò. Basic Colors: Blue - Red, Black - Green.