they are rather easy to make, though reserve plenty of time; it’s a nice project for holiday crafting with girls (around and over 10 years old I would say)
you can follow tutorial on this website
or just buy some here
I wasn’t quite sure how to finish them; I didn’t want to keep the knots at the ends and just tie them. So after much thinking I sewed narrow strips of leather on one end, a button on another, cut hole in the leather and now it sits nicely around the wrist. Two of them are also embellished with chain of rhinestones, bought on e-bay.