M3 stylus with 1.0 mm diameter ruby ball, tapered carbide stem, and 4.0 mm diameter x 6.0 mm long stainless steel base. Minor stem diameter is 0.7 mm; major diameter is 1.5 mm. Overall length is 40.0 mm. Stylus weight is 1.10 grams. Compare to Zeiss 626123-0044-045.