It looks like a strip of Micromail. It can fit tighter around the wrist than a standard bracelet. It's worth noting that I can't get my hand through the strap at the max size, but barely. However, the design isn't an issue as one end of the watch becomes a loop and the strap attaches to the other end. The strap goes through the loop and is easy to fasten after tightening. The magnet is pretty strong and I'm not worried about it loosening or getting stuck just yet. .
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