From the manufacturer's official website:

Hollowtech II crank and bottom bracket combines race-proven hollow forging technology with the integrated crankset & bottom bracket. Weight is reduced while rigidity & power transfer is radically increased.

In addition to Hollowtech II integrated design; the crank arms are hollow which provide amazing strength and rigidity at a light weight.

Finally, SG-X chainrings enable super smooth front shifting. Special tooth profiles, pick-up spikes and ramps help make the front derailleur shifts quiet, easy and trouble free for you the rider.

Features:

• HOLLOWTECH II crankset offers optimum balance of lightweight and rigidity
• Smoother rolling from minimal bearing interface of integrated bottom bracket
• Gearing: 52-39T, 53-39T, 53-42T, 50-39T
• Crank Arm Length variations: 165mm, 167.5mm, 170mm, 172.5mm, 175mm, 177.5mm, 180mm
• Weight: 740g (53-39T, 170mm including BB)

Specifications:

• Rear Speeds 10
• Chainring Combination 53-42T 52-39T 53-39T 50-39T 54-42T 55-42T 56-44T
• PCD 130mm
• Splined Crank Yes
• Crank Arm Length (mm) 165 167.5 170 172.5 175 177.5 180
• Chain Super Narrow HG for 10-speed
• Bottom Bracket Model No. Chain Line SM-FC7800 43.5mm
• Hollowtech Crank Arm HOLLOWTECHII
• Crank Arm Material/Finish Aluminum/ Anodized
• Top Gear Material/Finish Aluminum/ Anodized
• Low Gear Material/Finish Aluminum/ Anodized

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