M3 XXT stylus with 0.3 mm diameter silicon nitride ball, tapered carbide stem, and 5.0 mm diameter x 9.0 mm long titanium base. Major stem diameter is 1.0 mm; minor diameter is 0.2 mm. Overall stylus length is 15.0 mm. Stylus weight is 0.49 gram. Compare to Zeiss 626103-5245-015.