This 1 1/4 inch Diameter On / Off button has the words ON on one side and OFF on the other side engraved into the chip. The thickness of the button is about 1/8 inch thick. This is the same one as used in the casino.

This is not the full sized button that is turned off when there is no point.  This is the chip button for when a particular player calls his table bets off during an ongoing craps game