M2 stylus with 0.8 mm diameter ruby ball, stepped carbide stem, and 3.0 mm diameter x 6.0 mm long stainless steel base. Minor stem diameter is 0.6 mm, major diameter is 1.0 mm. Overall stylus length is 20.0 mm. Stylus weight is 0.42 gram. Compare to Zeiss 626112-0080-020.