Metal will transfer charge more easily than other conductors, especially silver.
Glass is at the other end of the scale as it is an insulator (though not quite such a powerful insulator as rubber). It is hard to believe but metal has a conductivity somewhere around a million trillion times greater than glass.
Conductors allow electrons to pass freely between particles. An item made with good conducting material will allow charge to pass along its entire surface.
Of course, even humans are conductors, we've all had static shocks which can be slightly painful for a split second but it is quickly distributed through the body and does no harm as it is too small to do any harm. Yet we all know what happens when the body is exposed to too much electric current, what a painful way to die!
