M3 stylus with 1.0 mm diameter silicon nitride ball, carbide stem, and 4.0 mm diameter by 6.0 mm long stainless steel base.  Minor stem diameter is 0.8 mm, major stem diameter is 1.0 mm.  Overall stylus length is 24.0 mm.  Stylus weight is 0.66 gram.  Compare to Zeiss 626123-0045-024.