For the love of all that is in my meager bank account don't put these bracelets on your child unsupervised. Or if they are so young they're still sucking on anything they can find. I've used a 2 part, near indestructible epoxy to secure the buttons, but children's saliva is a mysterious compound that turns ordinary goldfish crackers into cement.
But for the "mature" and supervised child - I think these are the bomb. If you would like a custom one for your child, or older child just let me know! I also do some mad gift packaging with jello tins and cello paper.