From the manufacturer's official website:

Body and levers in composite characterize the Ergopower™ Chorus™ 2007 controls, with lightness and strength for the most demanding athletes. The left-hand control is of the QS™ type to interface with the new QS™ front derailleurs and snappier and lighter shifting.

These are very light controls which maintain the possibility of shifting to smaller sprockets, even jumping lots of positions in one step, and permit micro-adjustments of the front derailleur.

The great ergonomics and an aggressive design for a product which provides the maximum performance levels an integrated control can offer.

For caliper brakes - double/triple crankset compatible – composite body – composite levers - light alloy hardware - ErgoBrain 10™ computer ready.

Nominal weight: 348 g.

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