The product is gold-plated xuping - also called medical gold. Color change is minimized - durability is at a high level. It is a compression earring - lightweight. You do not need to have a pierced ear to use it. It is placed at the thinnest part of the ear, paying attention to its curves - it is moved downwards and upwards and left where it naturally remains. It is sold individually. It does not affect pool and sea water. It should be protected from chemicals. Since it is a hygiene group product, it is not suitable for exchange or return.