http://www.wigglefin.com theses little things seem to add some nice shake to the lure. like the hoochie action.

The reason I use a dodger instead of wiggle fins is that the dodger displaces water and creates pressure waves that attract fish (so I'm told) and add action to the lure/bait. Also, the deeper you troll, the bigger the dodger because of the higher density of water.

They should be fine for topwater/shallow fishing though.

I tried those for about a week solid this past summer and never really noticed any differences in productivity. Ran two of the exact same flasher fly combinations, one with that wiggle fin and one without, both set ups seemed to catch fish equally. However, there was a definite action given to the fly with the wiggle fin.

looks like a nifty little trick for bass and it wouldn't surprise me in the least if you could get a rock fish or perhaps a clean cut or some other predatory saltwater species to strike that not to mention their probably tremendous in fresh water though they look a little expensive for what they do,but is there effective I have nothing against them.