These are 4 SPY×FAMILY hard enamel pins. Hard enamel pins are heated to a high temperature and then polished, creating a bright, smooth, hard enamel finish. Product name Custom pattern SPY×FAMILY enamel pin Material Zinc alloy / Stainless Steel / Iron Design 2D/3D, Custom shape+logo Technology Soft enamel , Hard enamel ,Die Struck Ect Shipping FedEx / DHL / UPS / TNT etc.