I don't know that they need to have any special unbreakable ability since bronze is probably beyond a supervised slave's abilities to break anyway. I suppose you could have a specific ability should the slave warrant it.
I guess the question is does a blanket "suppress magical abilities" feature work or do you need separate ones for theists, animists and sorcerors (or shudder mystics:-))? Personally I think I'd prefer a one size fits/affects all approach but that might not gibe very well with the three fold world approach. A cool approach could be that the bracelets cut you off from the supernatural world leaving you firmly stuck in the all too mundane world.
Just some thought,
Oliver
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