This is a matched pair of turks head knot cuffs made out of a single piece of 1/8" braided nylon cord.
The weave design is 13x9x2 double diamond which creates a nicely proportioned size. They measure about 7 1/2" (191 mm) inside circumference in the relaxed size shown here. The loose weave will allow someone with adults size hands to flex them on over the thumb.
The ends of the cords are left loose (not bound together) so these cuffs can be slipped on an adjusted to a sung fit on your wrist. It's easy to work up the desired size by chasing the slack through the knot to the ends.