Corrugated Plastic is an excellent substitute for poster board for interior applications and very durable for exterior applications. Its surface is not affected by oils, solvents or water, and cleans easily. Even more, the fact that it's very durable for outside lawn signs, yard signs and political signs, it can be used indoor or outdoors and last for a long time. Corrugated plastic is aligned with flutes that generally run vertically on the sign to allow sign stakes to be inserted in the flutes. There is a slight detection of lines when looking at the material. The cut also allows the sign to be folded and carried in a briefcase or suitcase. At MyCardGuy you have a wide selection of sizes to choose from, and we never charge for extra colors. All our sign prices are based on full color... why pay the same price (and in most cases more money) for one color when you can have full color! All of our sizes are not listed below, so please call for pricing and more information.