Galli's first headset used tapered roller bearings, but this design proved to be too fussy about alignment to gain widespread appeal. Later Galli headsets were rebranded Stronglight roller bearing units, but Stronglight's rollers were cylindrical, not tapered. That, and the floating races Stronglight used, made them much more accommodating to misalignment than the original tapered roller design, but it does mean that there is always some sliding, rather than rolling contact between the roller and the race. But for a bearing that is not in constant rotation (like a hub or bottom bracket bearing), this was felt to be an acceptable compromise, giving the headset much better handling of thrust loads without damage than a "ball and cup" unit, much lighter weight, and only minimally more friction than a ball and cup bearing (not enough to affect performance in use).