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Yes, that's it, too. But mainly, you have to be able to apply minimal pressure while shaving. "No flex" means that the edge is there, right on your skin. If you apply pressure, it will cut instead of...

A full wedge has zero flex. The three quarter hollows I have shaved with had flex. The 1/4 hollow Grelot I used to own had a distinct *ding* sound (as opposed to the *whoosh* sound of a wedge, and...