M3 XXT stylus with 0.8 mm diameter ruby ball, stepped carbide stem, and 5.0 mm diameter x 9.0 mm long titanium base. Minor stem diameter is 0.6 mm; major diameter is 1.0 mm. Overall stylus length is 20.0 mm. Stylus weight is 0.70 gram. Compare to Zeiss 626103-5644-030.