It is hook that is mainly used on the wrists and ankles of ball jointed dolls. It's a ?-shaped ring. This pin is mainly used for Dollmore Narsha. It is used for wrist parts together with an I-shaped pin bar (1.3cm). It is made of steel (anti-oxidation plated) There is no corrosion of this s hook and it is very hard hook which doesn't bend esily. This is a very sturdy and good pin..