M2 star stylus with five 2.0 mm diameter ruby balls. Fully adjustable. 30.0 mm between ball centers. Center stylus length is 20.0 mm from base to ball center. Stainless steel fittings with 1.0 mm diameter stainless steel stems. Weight is 2.04 grams. Compare to Renishaw A-5000-3626 and Mitutoyo K651054.