Single-side star stylus with 0.6 mm diameter ruby ball, stepped carbide stem, and two-piece clamping titanium hub. Minor stem diameter is 0.4 mm, major diameter is 1.0 mm. Assembled stylus weight is 0.92 gram. Compare to Zeiss 626103-0060-425. Q-Mark can repair damaged styli for a lot less than the cost of a new star stylus. Please email firstname.lastname@example.org for more information.