The 11-25t gear ration could be the best all-around ratio Campagnolo offers. The 11t is perfect for rolling out the gear in a fast group ride or race and also gives a little more high-end for riders using compact cranksets, while the 25t on the low end provides some more climbing power.
Campagnolo gives us a perfect example of how to machine precision cogs and assemble a cassette. Record 11 cassettes now feature Ultra Shift® profiles cogs for improved shifting and are mounted to a lightweight alloy carrier frame. The carrier shaves weight and provides better force distribution on the freehub body. Top 3 cogs are custom drilled and made of titanium. Alloy lockring included.