M2 stylus with 1.0 mm diameter silicon nitride ball, stepped carbide stem, and 3.0 mm diameter x 6.0 mm long stainless steel base. Major stem diameter is 1.0 mm, minor stem diameter is 0.8 mm. Overall stylus length is 20.0 mm. Stylus weight is 0.41 gram. Compare to Zeiss 626102-0045-020.