Triangle of 2.5 inches sides (63 mm.) FULL COLOR SANDSTONE KeyChain, depicts the Warning Ejection Seat Sign from Fighter Planes; White on Gray Sign with both sides embossed letters and simbols.
It has a 0.16 inches (4 mm.) hole to use it as a keychain and 0.14 to 0.18 inches (3.5 to 4.5 mm.) thickness. However Full Color Sandstone is a hard, brittle material ill-advised for daily handing, and haven't to be exposed to water as it will cause fading.
Full Color Sandstone Material Info Topic about Varnish over Full Color Sandstone Models