I do not want to go into the technicalities of different combinations consisting of petals, cargo, tail hook, just because at the moment they have several dozen, tomorrow will be a hundred. And with each company wants to make a contribution in the name of the numerous and ingenious combinations, introducing additional confusion in the definition of bait.
First such devices appeared in Moscow in the late 60's, I began to catch them from the mid-eighties. The general conclusion to which I came, using this type of bait, disappointing: despite the natural curiosity and simplicity in selecting the object of hunting, various "stack" of pike are not popular, and it takes them very reluctantly, reacting minnow. Where the concentration of small pike, "stack" can be safely left at home. And where there is a lot of it, it takes over everything.