From the manufacturer's official website:

The Ergopower™ Centaur™ 2007 controls have been completely renovated, thanks to the adoption of composite levers, the new Escape™ mechanism, and the left-hand QS™ control.

The most important feature technically is the weight loss of about 70 grams, but similarly important is the evolution of the design, thanks to composite levers which powerfully identify the product's pure competitive essence.

Along with the QS™ front derailleurs they offer even snappier and lighter shifting.

For caliper brakes - double/triple crankset compatible – composite body - ESCAPE™ mechanism - not compatible with ErgoBrain™.

Nominal weight: 334 g.

For more information, please visit this product's webpage.