M2 stylus with 0.5 mm diameter ruby ball, tapered carbide stem, and 3.0 mm diameter x 5.0 mm long stainless steel base. Minor stem diameter is 0.3 mm and major diameter is 1.0 mm. Overall stylus length is 10.0 mm. Stylus weight is 0.31 gram. Compare to Renishaw A-5000-7805 and Zeiss 623062-3132-000.