M3 stylus with 1.0 mm diameter silicon nitride ball, stepped carbide stem, and 4.0 mm diameter x 6.0 mm long stainless steel base. Minor stem diameter is 0.8 mm, major diameter is 1.0 mm. Overall length is 25.0 mm. Stylus weight is 0.74 gram. Compare to Zeiss 626123-0045-025.