... use defferent materialTechniqueDie-casting, engraved, painted, silk screen, offset printing,laser,plating etc.PlatingGold, silver, nickel, brass, copper, ... defferent product have defferent sizeLogoSoft enamel, laser engraving, offset printing, etc. Customize logo.can add epoxy or not BackFlat ... badges, labels, bottle opener, the (school) number plate, jewelry and other crafts of all kinds of hardware ...