M2 stylus with 0.3 mm diameter ruby ball, tapered carbide stem, and 3.0 mm diameter x 5.0 mm long stainless steel base. Minor stem diameter is 0.2 mm, major diameter is 1.0 mm. Overall stylus length is 10.0 mm. Stylus weight is 0.21 gram. Compare to Renishaw A-5000-7800 and Zeiss 623062-3131-000.