This charm bracelet includes all 7 of the super mini Harry Potter books. The chain is 6 1/2″ long, but has an extra length of chain at the end so you can adjust the size. With that length + the clasp at the other end, the bracelet is 8 1/2″ long. As you can see in the second picture, it fits comfortably around my wrist, and I have a tiny wrist (about 5 1/2″ around, so I had to fasten the clasp on the actual chain itself rather than the extension).
There are several charm add-on options. If you choose one, I will attach the charms at various points on the chain in between the books. I tried to make some combinations relevant to the series.