Ball (Silver Black) 2mm 3mm 4mm (Gold) 4mm Shaft 6mm These are click-in earrings. Click-in earrings, not authentic. I couldn't take the catch off because it was too stiff. It seems like it requires some force. Since they are thin, they can probably be used as regular earrings. I'm selling them because they are difficult for me to handle. I'll include two extra catches as a bonus. Thank you. Material...Stainless steel Color...Silver系 (Silver-toned) Scratches/Discoloration...None #HalloweenOnMercari