M2 stylus with 0.3 mm diameter silicon nitride ball, tapered carbide stem, and 3.0 mm diameter x 5.0 mm long stainless steel base. Minor stem diameter is 0.2 mm; major diameter is 1.0 mm. Overall stylus length is 23.0 mm. Stylus weight is 0.32 gram. Compare to Zeiss 626102-5245-023.