Some parts are more loved and better than others. Cannondale’s over 10 year old Hollowgram is one of them. Became a bit lighter with Hollowgram SL and thicker arms, then a little more different and lighter with the new Hollowgram SiSL2. But still works in the same way, still you use the same arms for every bike no matter if you’re a freerider or roadbiker. It’s light, it’s stiff and you can use what ever chainring combination you want. A lot thanks to FRM, Experimental Prototype, Zeta components and the biggest Leonardi Racing. Leonardi has made spindles, spiders, chainrings and all other parts you can come up with. So of course they were the first to make a spider for the new Sram XX1 chainrings. (Experimental Prototype soon has one too).
The biggest WW-store in Europe got it and put it on a nice scale just for us customers:

132mm spindle so normal for a Scalpel, Flash or any other of todays bikes with BB30 of PF30. Almost 90g lighter than my Sram XX1 crank with 36t. This has 32t which is the standard.
More about weights on R2-bike blog and if you want it, it costs 827,5€ here: R2-bike.