Front wide backs that have received many evaluations from all directions. However, there were many opinions that "I want to capture the upper layers with the same shape". Bux slightly wider, shorter and thinner. These were the three conditions for Dohna development. And "unbalanced". Irregular action that suddenly makes an unbalanced movement regardless of the fisherman's intention is also included in the condition. In addition, conscious of the upper layer, this is also the world's first thin hammered process. Moreover, it is an item that has been given an unprecedented halftone on both sides and challenged the fundamental proposition "How many trout can be caught?".