Heavy Duty 10mm Coroplast is .39" Thick.  Works well for:

Sign in picture is (2) 46" Wide x 36" Tall 10mm Thick Coroplast Signs.

These signs ship regular ground freight and can be stacked to make any size sign.

10mm Coroplast is thick and rigid enough to be mounted between posts with no backer.  It is also light enough to be tie wrapped to a fence without bending or kinking.

Available with or without grommets / Free Shipping.