M3 stylus with 0.2 mm diameter carbide ball, stepped carbide stem, and 4.0mm diameter x 5.0 mm long stainless steel base. Minor stem diameter is 0.17 mm, intermediate diameter is 0.5 mm, and major diameter is 1.0 mm. Overall stylus length is 20.0 mm. Stylus weight is 0.54 gram.