I ordered 36, 18 and 12. They get thinner as they get shorter, but thick enough not to sag under their own weight if you weigh one of them I think. 12 is thinner than its foam backing and has the thickest backing. The 6 inch engraved steel ruler I got for free when I bought it from a gem wholesaler was thicker than this one. The lining was also thinner. Also, the hole should be big enough to fit under a standard screw head so you don't have to find anything to hang them.
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