11-21 ( 17-19 made from Titanium) 9 speed drive train.
With 2 titanium sprockets, This is a 9 speed cassette with 10 speed spacing, for the Campagnolo Ghibli Ultra Disc Rear Wheel which has a 10-speed freehub.
Hence a 9 speed cassette which indexes with 10 speed levers.
A 9 speed cassette with 10 Speed spacing. Compatible use with all of Campagnolo’s 10 speed component groups.