That's not a standard watch band. If you look under the watch body you'll see a notch that requires the watch band to have a gap in the center. If you look at standard watch bands they don't have this gap. I had to shave away the notch on my 360 to attach a nice high quality stainless band. I didn't like the pebble band at all. It's a little flimsy feeling. The pebble links aren't solid ingots, and if you look at the edge you can see they're folded sheets. That fold collects sweat residue, old skin, and grime inside after a while. Lots of times when people complain that metal bands irritate their skin its because they have a folded metal petri dish strapped to their wrist. Good activity watch bands use solid links to avoid that.
Here's a post I made when the watch first came out detailing what I had to do to attach a really good standard 316L stainless steel solid link band:
3rd party metal bands - Post 28 - XDA Forums
There's no center gap :
Here's the gap on some bands:
The high quality band takes the watch to the next level in looks and adds considerable weight: