I can say there is a definite difference holding an aluminum chassis in one hand and a mag in the other. I can't tell you how that calculates on the rink. I went from an aluminum chassis to sprungs, and then skated on a set of mags for a pick up game and then converted back to the sprungs. I was much more focused on my actual skating rather than how much my skates weighed. But I can say that they are crazy light.