It is in the design of the core. Typically, pieces of wood are are put together side by side, horizontally, then moulded with a top sheet and base.
Cross section of a ski:
_______ This layer is top sheet
OOOOO this layer is wood side by side
----------- This layer is the base material.
THe afterbang's core is designed like a skateboard, with the wood being stacked on top of one another. Such like a pad of post-it notes.
___________ This is the 1st layer of core.
___________ This is the 2nd layer of core.
___________ This is the 3rd layer of core. etc....
Now as for the edges, my guess is that the edge section underfoot is typically under your plastic sidewall (or whatever material the sidewall is made of, im not sure) This is a soft material, and will deflection under impact, causing some deflection in the steel edge. Constant stress and strain in this section will fatique the metal and cause edge blow-out. Im guessing the Afterbang's edge is attached to the wood core underfoot. Therefore the edge is attached to a stronger material that won't bend or deflect on impact.,
You edge could still crack or dull, but it won't break away. well that's my reasoning at least
