These are Flush - Full Relief Cutters:
Both cutting edges receive a tiny bevel by diamond honing over the entire outer length. The bevels are at 60 degrees to the plane of the cutting surface. They are no more than 0.12mm in width and thus form an exceptionally small V-shaped groove along the edges. This beveling also results in a rugged and very long-lasting cutting edge interface. It also yields only the tinniest raised surface, or "pinch", on the cut lead. Many users of Tronex cutters believe that the Flush edge finish provides the most desirable balance between long cutting life, flush cut leads, and cost.