This is a groundY x Chainsaw Man collaboration earring. It's designed to resemble Denji's starter cord, and it's a very cute item that sways at your ear when worn. Discoloration is noticeable, but it's likely due to sulfidation rather than peeling plating. I think it can be restored to its original beauty using a method with baking soda and aluminum foil. ground y groundy Chainsaw Man Jujutsu Kaisen