M3 stylus with 0.3 mm diameter ruby ball, stepped carbide stem, and 5.0 mm diameter x 9.0 mm long titanium base. Minor stem diameter is 0.2 mm, major diameter is 1.0 mm. Overall stylus length is 13.0 mm. Stylus weight is 0.46 gram. Compare to Zeiss 626113-0030-013 and Renishaw A-5004-3176.