M3 stylus with 0.5 mm diameter ruby ball, tapered carbide stem, and 4.0 mm diameter by 6.0 mm long stainless steel base. Minor stem diameter is 0.3 mm; major diameter is 1.0 mm. Overall stylus length is 20.0 mm. Weight is 0.67 gram. Compare to Zeiss 626123-5444-020.