From manufacturer's official website:

The 2007 range of Ergopower™ Record™ controls, body and levers, are still in composite but their left-hand control mechanism has been slightly modified to increase the performance reference when interfaced with QS™ front derailleurs.

The modification is to the indexing mechanism in which the idle stroke has been shortened so that the lever begins to act on the derailleur after a few degrees of actuation and shifting is snappier. And then, thanks to the modification of the derailleur, it is even lighter.

Ergonomic and ultra-light, integrated Ergopower™ Record™ controls constitute the absolute benchmark.

Nominal weight: 324 g.

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