the hollow bronze things with the studs?

probably not some for of die- divination or otherwise. They just wouldn't roll well. There's a few uses for those things that seem likely. Rangefinding (mount it on a staff and peep through the holes, , some sort of symbolic use, or simply just being some sort of decorative weirdness.

(I mean, really. Think about all the jangly things people have on, like backpacks or purses or keychains. People have always been people.)

IIRC weren't those knitting implements/frames? idk the only thing i know to do with yarn is play with it :3