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These are similar to Wheel Bands sold on amazon (http://amzn.to/2lS8Alg) but I got them for much cheaper by buying a set on aliexpress (it just takes a few weeks to get here from China). The aliexpress link is here but you can sometimes shop around and find it for cheaper, etc.
I have not actually used the real wheel bands and I'm guessing those are a lot better but for the price, I just went with the cheaper ones. We'll see how long these last in terms of the adhesive, etc.