In the usual way, Ultegra is the beneficiary of technology handed down from Dura-Ace products. In this case, the WH-6700 Ultegra wheels share many features with the Dura-Ace WH-7850 carbon laminates.
If you want to try tubeless, you can without any tricky tape job on the rim bed as the spoke holes do not protrude through the rim and the rim seam has been sealed. And if you don't care, you can run normal tubed clinchers. If you're on the fence, you can hedge your bets by getting a wheelset that can go both ways.
The Hub uses angular contact bearings designed to cradle the balls giving both radial and lateral support for superior strength and durability in real world riding conditions. They also offer precision bearing adjustment and easy maintenance. They also offer precision bearing adjustment and easy maintenance.
As with all Shimano wheels, these come with skewers and a spoke magnet. The Shimano Ultegra WH-6700 tubeless wheelset has a claimed weight is 1652g (695g front, 957g rear).