For use with the Campagnolo Chorus, Record and Super Record 12x groupsets.
With the additional sprocket on the cassette the need for a range of cassettes is eliminated. The extra gear allows for single tooth increments all the way up to the 7th sprocket. The shift curve on these new cassettes is so much smoother than competitor 11 speed brands. The cassette fitment is an identical width to the 11-speed versions so they are compatible with all existing Campagnolo freehub bodies.
When researching other 12-speed equivalents on the market, they found an incredible amount of flex due to the single ring set up of the cassette. Campagnolo cassettes are fixed to a spline to offering greater rigidity and smoother shifting. The cassette's last two triplets are CNC'd out of one piece of hardened steel for optimum stiffness Alloy spacers have been used for improved durability and weight saving.