Optima Modified Writing (0.040 inch) Fixed Handle Tip. Very similar to the standard 1479 but has the end of the tip ground symmetrically and the end is perfectly round. This is a good choice when you need it for more than just signing your work like for "Pointillism" or drawing and the "choke point" created at the end of the tip also keeps the pen body much cooler for much longer than the standard 1479 pen does. The end of the tip is about 0.040" (1 mm) in diameter. Look at the 1489 pens if you want something similar but bigger.