I have the feeling this may be the "race" version of the regular PX12. The main difference between the two is the healpiece, there is more metal in the race version and you get a wormscrew adjustment rather then a lift tab. This is werll worth it in terms of the PX line of bindings, much more consistent forward pressure. The other difference is the teflon or non-movable AFD on the race versions vs a moving AFD on the regular PX's.