OK good
They may be, what we don’t know yet is how well they hold up and whether they show better lifetime and failure behaviour than the steel or kevlar cored belts which they may.
In the meantime, I’m not in any rush to take the cheaper Kevlar cored belts off mine, or wait another 2 weeks for delivery from the only UK supplier I could find for the other two belts I’d need for the Y axes.