From the manufacturer's official website:

The new Chorus™ Ultra Narrow™ 10s chain is just 5.9-mm wide. These new dimensions make it lighter and more silent and facilitate adjustment of the rear derailleur. The links have been lightened so that the chain weighs only 269* g in all.

The tests run in our laboratories show that traction force, pin retention force, wear and resistance to stretch, torsion and flection are the same as for the Record™ 10s chain.

10s - width 5,9 mm - Ni-PTFE Finish - 114 links - Ultra·Drive™ - HD-Link™ for Ultra Narrow™ chain - lightened links.

Nominal weight: 2,36 g. / link. (2,36 x 114 links = 269 g.)

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