Hypoallergenic ion-plated earring posts with a loop. Say what? Ion Plating? There's a bunch of science behind it, but the short story is that Ion Plating is lighter, 8x more durable and more eco-friendly than regular plating. It is particularly suited to stainless steel and creates a far more hypoallergenic finish than stainless steel alone. It is a more expensive process, but your earring finish will last much longer. I have a pair of Ion Plated leverbacks that are 25 years old! NOTE: A bit more chemistry. Black is electrophoretically plated, which markedly reduces the rubbing or fading of the color which can be a problem in black jewelry. 8 mm cabochons par Puca Available in Gold plate, Black plate, Platinum, Rose Gold Each order includes 2 Pairs Materials: Ion-plated, Hypoallergenic.