Strap measures 6mm wide. Clasp is magnetic.

+ To Measure Your Wrist +

To measure your wrist, you will need a flexible measuring tape, like the ones used in sewing, or a strip of paper or piece of yarn and a ruler. If you're using the measuring tape, wrap it comfortably around the wrist where you'd like the bracelet to sit. Make sure it is taught, but not tight. Where the tape overlaps is your wrist size. If you're using the paper / string method, mark where it overlaps and then place it next to a ruler to get your measurement.