These hearts are engraved, which is high quality and permanent. The hearts are shiny stainless steel that is tarnish free! All parts are stainless steel.These are 14 inch gauge, which is a standard gauge for nipple piercings. The ball at end screws off and on to make wearing it easy! Perfect Anniversary, Birthday or Christmas gift for yourself or your loved one! These are for pierced nipples, easy to use and clean. Comes in a gift pouch for easy giving and doubles as storage when not in use!!