M5 stylus with 0.3 mm silicon nitride ball, tapered carbide stem, and 11.0 mm diameter x 10.0 mm long stainless steel base.  Minor stem diameter is 0.2 mm, major diameter is 1.0 mm.  Overall stylus length is 18.0 mm.  Stylus weight is 5.57 grams.  Compare to Zeiss 626105-5245-018.