Tied on a Mustad 37160 (#20 shown here), these flies have been great the last few times I’ve been out. I tie them in light brown, dark brown, and black to imitate the naturals in the water. I tied several with a traditional brass bead and several with craft store beads that I found appealing. The black flashback versions that have a black wire rib rather than traditional copper have been producing very well as they imitate an Ephemerella Invaria nymph that are in full force on our area streams right about now. I lost a few this last time out but I tied a few extra, for those who love to tie flies I suppose.