Campagnolo Ekar 13 Speed Cassette is machined from two blocks of steel for light weight & durability. The upper 9 cogs are mounted on an aluminum carrier. The lower 4 are lose cogs.
This cassettes require the new N3W Campagnolo freehub body to fit those smaller cogs behind a lockring, but the 13-speeds fit within the same width as Campy 12, so there’s no change to hub spacing or wheel dish.
Campagnolo Ekar cassette is available in 3 variations Endurance 9-36T (400%), Gravel Race 9-42T (467%) & Gravel Adventure 10-44T (440%). Gear spacing remains tight & relatively constant in the middle ranges of gearing for smooth cadence steps, then shift jumps get bigger as you are looking for bailout gears to get up steep climbs.