My DS5 uses fidget toys at school to help keep the rest of his body more still. The fidget cube was recommended by his teacher and is his favorite, but some of the sides do make a clicking noise which could be annoying to some. There are lots of different kinds of fidget toys you can try. The ones he's tried that I personally find more sensory pleasing in my hand include squishing a small ball back and forth in a small soft tube and several made from bike chains or key chains. I've never been a fidgeter myself but I've considered taking one to a work meeting to see if I find it calming
Anyway, I think there is a lot of room for trial and error and personal preference. One difficulty is keeping track of a small object; our cube has been lost and found a few times.
