Ring magnets (also called cylinder magnets) are large, flat disc magnets using a tiny hole in the middle. They have been invented by a silversmith in Toledo, OH. Neodymium magnets are rather common, however they don’t have the widespread appeal that some other magnetic substances do. But it is not because they are ugly or badly made. It is because there are a good deal more other kinds of magnets available that are much better quality and much more economical.
The largest difficulty with neodymium ring magnets is they tend to lose their shape a little too quickly, which causes them to lose their usefulness for several decades. If a few of them get tangled up in a vehicle, for instance, and it is in transit, then the magnets will likely to begin hurting. They are still fairly robust ring magnets, however, which means you probably will not have too much trouble just pulling them apart. But the point is the cost of replacing a worn out or misaligned magnet is much greater than the purchase price of a good excellent ndfeb ring magnet.
Luckily, there are strategies to get a great deal on these types of magnetic devices. You will find magnetic craft stores, like Hobby Lobby or Pier 1 Imports, that sell quite affordable neodymium ring magnets as well as other similar goods. But you may also purchase them off of eBay, Amazon, Craigslist or directly from the manufacturer.