I'm just installing the 2010 Force brifters on my bike and there are a couple of weird things.
1 - they supply two different types of cable housing. One looks 'normal', but the other is slightly thinner externally and looks to have a braided wire internal sleeve instead of the solid tube of the normal stuff.
2 - ferrules are in two sizes. Same external diameter, but the 'SRAM' branded ones only fit the thinner cable housing. The plain black ones have a larger internal diameter and fit the 'normal' cable housing.
So - is each type of housing for a different use? One for the brakes and one for the gears?