Because fish have eyes too..
These Wapsi dumbbell lead eyes are one of the most popular eyes out there! The dumbbell eye is a widely used fly tying material and is used in many innovative fly patterns such as Bob Clouser’s Swimming Minnow. Few fly tyers realize that dumbbell eyes are just one of many fly tying materials that originated at Wapsi. They are solid lead and fit hooks sizes 1-14. These eyes add action, weight, and looks to your fly.