M5 stylus with 1.0 mm diameter ruby ball, stepped carbide stem, and 11.0 mm diameter x 9.0 mm long stainless steel base.  Minor stem diameter is 0.8 mm, major diameter is 1.0 mm.  Overall stylus length is 15.0 mm.  Stylus weight is 5.55 grams.  Compare to Zeiss 626105-0044-015.