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 (T457B) are 2.5 mm & 3 mm (0.10" & 0.12"). Order all 4 Euclid double ball styluses (or a combined total of 4 of any style ) and get 20% off!