It has been suggested by some scientists that UV light is highly visible to fish, which is why weve included UV particles within the paintwork of the Vibrax UV. The patented two-part body, which virtually eliminates line twist is really what sets all Blue Fox spinners apart. Whether casting for still water predators such as perch and chub, or working fast moving rivers for trout and salmon, this low-frequency spinner is going to create the noise and vibration required to trigger a strike.