I think the one that Roberta really loves is velcro. Or at least it is a nylon or some sort of fabric bracelet. It also uses a paper insert rather than being engraved, like the metal ones.  My son uses a necklace so I can’t speak from experience, and I unfortunately cannot recall the web-site that Roberta gives all the time. Roberta- Can you repeat it again for Melina’s Mom?