The Ultegra 6800 series is "pro-proven" as it is a direct trickle down from the Shimano Dura Ace groupset.

1. Shimano Ultegra 6800 11 Speed
Groupset

2. The Ultegra 6800 series is "pro-proven" as it is a direct trickle
down from the Shimano Dura Ace groupset. It stands for state-of-
the-art technology, proven in pro races, the technology used
in the new Ultegra 6800 series with 11 speed, newly designed
brakes, new chain treatment etc.

3. Crankset:
With a unique four-arm spider and Hollowtech II construction putting
strength just where its needed, the FC-6800 chainset sets new standards
for stiffness and low weight.
Ultegra FC-6800 Crankset Standard 39/53 teeth
Crank Arm Length: 170mm or 172.5mm
New 4-arm design for same stiffness with lighter weight
Hollowtech II construction
Hollowglide chainrings
11-speed compatible
Same bolt circle diameter for compact and traditional double chainsets
means that one crankarm fits all chainring sizes
Bolt circle diameter: 110mm
Chain line: 43,5mm
Incl. Hollowtech II Bottom Bracket SM-BBR60 BSA
Weight: 765g (with BB)

4. Dual Control Shifters Set STI
Ultegra ST-6800:
With smaller, sleeker hoods, the 11-speed compatible ST-6800
STI units deliver improved ergonomics for better rider comfort
and control, with reduced lever stroke and lighter action.
Tactile feedback to the rider that the gear shift has been
completed
Light action, define click engagement Vivid index shifting
Short lever stroke response
Powerful and controllable braking system
Carbon brake lever
Weight: 425g (Set)

5. Ultegra Rear Derailleur RD-
6800 SS:
The 11-speed Ultegra rear derailleur has been redesigned for
lighter operation with the help of new low-friction polymer-coated
cables. Shifting effort is now more even across the
range, with similar force required at both ends of the cassette.
Fast and accurate shifting
11-speed design
Maximum sprocket 28T
More equal shifting effort through the range
Weight: 195g

6. Ultegra Front Derailleur FD-
6800 Braze On:
With a revised actuation ratio in combination with the ST-6800
shifter and polymer-coated cables, the new Ultegra front
derailleur delivers both a shorter stroke at the lever and
reduced effort.
New designed pull arm for more direct and easy shifting
More equal shifting effort across the range
New support bolt for more stable contact to the frame
Chainstay angle: 61-66°
Max. chainring: 50-56 teeth
Chain line: 43,5 mm
Mounting: Braze On
Weight: 89g

7. Ultegra Brake Set BR-6800:
Long, fast descents demand confidence. Ultegra brakes deliver,
with a new symmetrical dual pivot design and twin bearings
reducing pivot friction and improving efficiency and
controllability.
New SLR EV Technology
10% more power than BR-6700
Smooth and light operation with increased modulation
Brake Pad Types: R55C4
Weight: 335g (Set)

8. Cassette:
Rider-tuned means Ultegra works the way you want it. The new
11-speed cassettes are available in a range of sizes including a
wide-range 11-28 option - one cassette to use all year round.
Smooth, fast shifting guaranteed.
Ultegra Cassette CS-6800 11-25
Ultegra Cassette CS-6800 11-28
Ultegra Cassette CS-6800 12-25

9. Ultegra 11-speed Chain CN-
6800 116 Links:
The new symmetrical Ultegra 11-speed chain offers low weight
and high durability.
ULTERGA redesigned SIL-TEC Chain for 11-Speed
Weight: 253g

10. Resources:
http://goo.gl/uTDdVX
http://www.chainreactioncycles.com/bg/en/shimano
-ultegra-6800-11-speed-groupset/rp-prod110818

11. Thank you for reading!