Each gun metal card is laser cut from a sheet of darkened steel, chemically etched and brushed by hand.. Now available in three thicknesses, you can choose a 300 micron card which has memory, allowing it to spring back to shape when lightly flexed. Alternatively, the 800 micron metal makes for a rigid, weighty card that is sure to garner attention. The 500 micron variant is a great compromise between weight and rigidity.