These are the best health dials I have ever owned. They are very sturdy and smooth, perfect size (they are small!), have a rear stand, and are fully magnetic. This means there are basically no elements that could break or wear down during normal use. You just rotate these two numbered wheels in a very smooth motion. There are no clicking or rubbing elements, but they offer just enough resistance to never rotate on their own. What's fun is that you can fully disassemble and reassemble these things. And if you have multiple of them, they will stick together in a nice magnetic stack. Very cool!