These are screw-back earring parts. They have a loop for attaching to the earring. There are 20 pieces (10 pairs) each of flat silver-colored and half-round rhodium-colored posts, plus 2 pieces (1 pair) each as spares. These are not high-quality items, so the price reflects the possibility of minor defects. (40 yen per pair) They are unused and function normally. Returns are not accepted.