M3 stylus with 0.3 mm diameter ruby ball, tapered carbide stem, and 4.0 mm diameter x 6.0 mm long stainless steel base. Minor stem diameter is 0.2 mm, major diameter is 1.0 mm. Overall stylus length is 13.0 mm. Stylus weight is 0.47 gram. Compare to Zeiss 626123-5244-013.