M5 stylus, 0.5 mm carbide ball, stepped carbide stem, 11.0 mm diameter x 10.0 long stainless steel base. Minor stem diameter is 0.2 mm, intermediate stem diameter is 0.5 mm, major stem diameter is 1.0 mm. Overall stylus length is 15.0 mm. Stylus weight is 5.54 grams.