Loading... Please wait...This is definitely a shop favorite in early to mid-summer when Callibaetis mayflies are hatching on many stillwater trout lakes. We think part of its effectiveness also has to do with its simulation of a damsel fly nymph as well -- which are active during the same time of year. Whatever the case, this has been a good one for us fished on intermediate sinking or full-sink lines near the weeds. Size 14 pictured.