Action Backs are different to normal flies in that when in the water it is as if they come alive! The tail action makes the difference, they are unlike any other flies on the market. The way you can tweek them to make more action is awesome! When Lake fishing, you retrieve faster, and with more action. In the river, the current makes the tails look like the minnow is swimming along. A twitch, and the fight is on. Fish can't resist it. The tail is virtually weightless, and gives action like a real minnow!!!