The products are original rhodium plated xuping - also called medical gold. The product's mineral color is silver. It is offered for sale as a single piece. Detailed measurements are given in the photos. Color change is minimized - durability is at a high level. It is a compression earring. You don't have to have a pierced ear to use it. It can be used by passing it through the thinnest part of the ear cartilage and placing it downwards or upwards. It is a very mini product - suitable for children and small ears - not suitable for medium and large ears. It does not affect pool and sea water. It should be protected from chemicals. Since it is in the hygienic product group, it is not suitable for exchange or return.