Euclid all-stainless styluses feature similar, small-diameter balls on either end for smoothly incising or adding script to clay without raising a clay furrow. Ball diameters on this stylus (TP457) are 1 mm 1.25 mm (0.04" & 0.05"). Order all 4 Euclid double ball styluses (or a combined total of 4 of any style ) and get 20% off!