... can be zinc alloy,brass, iron Color can plated with different color,for this workmanship,we sent our products ... to electroplating factory to deal with the color we want,such as nickle,gun, ... style for your selection If you don't satisify with our stock metal button, we can offer OEM ... ,if there are any problems,pls inform us at first time,we sure we can deal with that perfectly.Other ...