M5 stylus with 0.5 mm diameter silicon nitride ball, tapered carbide stem, and 11.0 mm diameter x 10.0 mm long stainless steel base. Minor stem diameter is 0.3 mm, major diameter is 1.0 mm. Overall stylus length is 20.0 mm. Stylus weight is 5.66 grams. Compare to Zeiss 626105-5445-020.