I first learned about the Rebel Ringworm shortly after I started fishing for bass around 1980. A tackle shop owner recommended them to me. He also explained the concept behind this worm design. When cast, the rings would trap air, and create bubbles when the bait was retrieved or falling though the water. I'm not sure if this was true or not. My own reason for this being a successful worm is the way it looks. The rings make it appear larger than it's size, which is 4" mostly. As a novice bass fisherman, this was one bait that worked, and I was able to catch bass with it over a few years time. Then, it was gone, and no longer made by Rebel. I forgot all about them and moved on. Now I've " rediscovered" the ringworm, and we have several to pick from. Currently, I'm using Mr. Twister 4" ringworms. Zoom makes a good one, as does Roboworm with the Zipper worm. My best colors are junebug, black/ blue tail, and watermelon. I've only fished the 4" size, but they're available in longer lengths also Like all plastic worms, these can be fished several ways, depending on your own waters. It works on bass of all sizes.IMO, one of the best plastic worm designs of all time. P.S. If you fish clear water, a watermelon ringworm rigged with a split shot and slowly crawled along the bottom is deadly, shallow or deeper.