This wand went through four different designs! It started with a large, curved brush that resembled what I like to call a "banana with spikes." Benefit found it was too big for smaller eye shapes, made lashes heavy, and caused clumping.
Design number two was slim, with a subtle bend to the wand and a soft material. It was good but didn't create enough of a curl for straight and short lashes.
Design number three is where Benefit added the tiny "hooks" to the wand. These were made for the shorter lashes. While it did coat every lash, the curl wasn't right, and the location of the hooks wasn't conducive to creating a lifted effect.
The final design, number four, involved strategic hook placement so they would grab each lash from root to tip; the style is now Benefit's patent-pending Hook 'n' Roll brush.