They do hang and swing freely. They won't spin all the way around because of the design.
They are made from 20 gauge Aluminum craft wire and I had gotten one of those cheap stretchy bracelets, that was broken, from a friend, who paid $3.00 at JoAnns for it. It's one of those bracelets that has double holes, strung on stretchy cord and has that shaped dyed shell on it.
I love them, too! Thanks for the comments.