Came stock with my 2019 Roubiax Sport: ""Specialized Comp Hover Bar, 6061 alloy, 70x125mm w/ Di2 hole"". The engineering, materials seem pretty standard I guess. I think the top-level flat is okay but a bit big for resting of the hands, but I guess i'm a bit more comfortable with it and the higher rise for comfort than prior bars. Flex/bend/vibration seem about normal (but you have consider the Roubaix has the extra shock absorption in the headset). I'm not happy with it and I'm working on replacing it though. I deal with carpal tunnel and tendonitis and I am not finding this bar accommodating at all. My hands go completely numb even on short rides. Worse, the curve is too tight and it squeezes my hands and impacts my bones from both sides. Also, the shifters have to sit too high and out of reach without some bending and effort. I am unable to ride this bike long distances with these bars. Have been trying to get these adjusted, but it's not working. I do not find this a usable bar and and working on a replacement. I used to have an ergo bar that worked fine, but for some strange reason there aren't as many of these available anymore. I'm no pro rider, just getting back into it again after several years.