The ones that I mean are plastic on both sides and corragated on the inside. I found one batch of them that a lady had but her husband didn't like the advertising on them and told her to get rid of them. They are what the realtors use and they have metal stands that they put into the ground. They are great to wrap the fabric around and they don't bend. I tried one of the boards from the Dollar Tree and it didn't that the weight of 3 yards of fabric.