The CVR pattern is the ultimate evolution of the curved shank hook principle.
The unique shape ensures that the hook twists aggressively the instant the hook bait is taken and once the super sharp long tapered point takes hold the shape ensures that hook holds are amazing, thanks to the alignment between the hook point and the in-turned hook eye. The shape and alignment of the point with the eye also means that these CVR's excel as a 'barbless only' pattern, as the hook holds stay firmly in position in a similar way to a beaked point.
The length of the shank was dictated by the shape of the bend and the final position of the eye. Essentially, it