Hard enamel pins are made from die-struck iron and are known to be more durable and stronger than others. Plus, they also have a better finish and a more refined texture, since they are thoroughly polished before the enameling process. Product name Custom pikachu cute hard enamel pins 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.