M3 stylus with 0.3 mm diameter silicon nitride ball, tapered carbide stem, and 4.0 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 24.0 mm. Weight is 0.58 gram. Compare to Zeiss 626123-5245-024.