... pin back 1)Material: brass 2)Process: stamped + soft enamel 3)Size: 20mm 4)Plating: gold High quality button badge pin ... customer's requirement. (including Hard enamel, Pro-enamel, Stamped with soft-enamel, Die casting, Spin Casting, Etching, Offset printing, Laser ... also available - Thickness: Generally 0.25mm--5mm, depending on the size of design - Plating: Gold/ Antique Gold/ Silver/ Antique Silver ...