M3 stylus with 2.0 mm diameter ruby ball, 1.5 mm diameter carbide stem, and 4.0 mm diameter x 7.0 mm long stainless steel base. Stylus length to ball center is 30.0 mm. Stylus weight is 1.26 grams. Compare to Renishaw A-5003-0052 and Mitutoyo K651120.