M3 stylus, 0.3 mm ruby ball, 4.0 mm diameter x 5.0 mm long stainless steel base, stepped carbide shaft, 19.0 mm overall stylus length. Major shaft diameter is 1.0 mm. Intermediate shaft diameter is 0.50 mm. Minor shaft diameter is 0.20 mm. Stylus weight is 0.54 gram.
