Chain Bracelet

The challenge I tried to meet with this design is to make a design that could chain together but that would not come apart if you randomly shook and flexed it.
The two different pieces will only go together (or come apart) in one particular orientation. In this way it is almost a puzzle. Not sure if I need to post now to do it.
The full size print is (I think) big enough that a child can't choke on it. I am not really sure what the official dimensions should be, does anyone know?
The smaller