M2 stylus with 2.0 mm diameter ruby ball, 1.0 mm diameter carbide stem, and 3.0 mm diameter x 5.0 mm long stainless steel base. Stylus length to ball center is 10.0 mm. Stylus weight is 0.31 gram. Compare to Zeiss 602030-8001-000 and Mitutoyo K651239.