M2 stylus with 0.5 mm diameter ruby ball, 0.3 mm diameter carbide stem, and 3.0 mm diameter x 13.0 mm long stainless steel base. Stylus length to ball center is 20.0 mm. Stylus weight is 0.30 gram. Compare to Renishaw A-5003-1345 and Hexagon 03969269.