Sorry, but those aren't Whams.They are Blams, they are a knock off. Look at a real Wham, then the Blam. The fins are way too thick, the plastic is stiffer, and the colors are crap. They might work sometimes, but they won't keep up w/ the real deal. Rumors abound about just what happened, but one thing is for sure the W.K. ripoffs are not Whams. I'm just glad I still have a small stockpile left.