Stronglight Semi-integrated headset aluminum upper cup and aheadset lower cup mega oversize carbon upper cup 1"1-8 - 1"1-2

The semi-integrated headset uses bearings placed in cups, except that these are integrated into the steering sleeve.
The advantage of this solution is primarily aesthetic, with a clean line.
It also allows for a larger bushing diameter, which allows for a much more rigid construction, for the benefit of steering precision.