One thing I find as a 6 foot 6 male is that a lot of items were not made with people like me in mind. This even extends to products like fidgets.
Thankfully, I have been able to find at least one brand of fidget that does have several size options and that would be the Tangle family of products. They are made of plastic, so you can break them if you’re rough on stuff but on average since I am as well they last me a long time compared to some fidgets I’ve tested.
I get these types of items to review regularly, so out of all I’ve tried this is likely my favorite and my go-to as someone with larger hands. Fidgets for adults aren’t going to cause you any issues in public either, just don’t get the one with the finish that looks silver. I say that because people tend to tense up when you pull something silver out of your pocket in public as it can resemble a weapon for a split second.
In my opinion, the Tangle Palm Classic(click to use my affiliate link) size of product is actually the best one, as it fits in my hands and takes both of them to play with it.

There are also pocket sizes and more, but I’d say those are more for being on the go than at home.
I will try to keep everyone updated as I find more products in this category!