The bracelet is made of a leather cord, which is a slightly stiff material at first but once wet will mold to wrist of the wearer, and fit snug.
The leather will become softer with use, but will maintain it's strength. The color of the leather cord will also darken with age and eventually have an attractive patina to it.
The attachment is a hand made hook. Incredibly comfortable to wear, there is no need to ever take this bracelet off. Also, as shown here the small leather hook bracelet can be layered with other bracelets or cuffs.