Optima 5/64" Ball Fixed Handle Tip, Medium. This new pen is something many pyrographers have wanted for a long time. This tip is available in four different ball sizes: 1/16" S, 5/64" M, 1/10" L & 1/8" XL (1/8" XL shown here). This pen tip can be used to draw lines shade with do pointillism and much more (1/8" could be ground to a shape that suits your needs).