M5 stylus with 1.0 mm diameter ruby ball, stepped carbide stem, and 11.0 mm diameter x 10.0 mm long stainless steel base. Minor stem diameter is 0.8 mm, major diameter is 1.0 mm. Overall stylus length is 22.5 mm. Stylus weight is 5.66 grams. Compare to Zeiss 626115-0100-022.