Four-way star stylus with 1.0 mm diameter ruby balls, carbide stems, and two-piece clamping titanium hub. Major stem diameter is 1.0 mm, minor diameter is 0.3 mm. Star stylus weight is 1.10 grams. Q-Mark can repair damaged styli for a lot less than the cost of a new star stylus. Please email email@example.com for more information.