M3 stylus with 0.5 mm diameter carbide ball, stepped carbide stem, and 5.0 mm diameter x 9.0 mm long titanium base.  Minor stem diameter is 0.3 mm, intermediate diameter is 0.6 mm, major diameter is 1.0 mm.  Overall stylus length is 30.0 mm.  Stylus weight is 0.82 gram.