My DH bought foam core insulation board it is like a wall board, but weighs nothing, it is about 1/4 inch thick. I covered it with a very dense batting/felt like fabric I purchased from JoAnns fabric. The nice thing is your fabric will just stick to it like a felt board or you can actually pin into it with straight pens. It is great. I have attached it to the wall with the 3m hooks that do not make a hole or leave residue on the wall. I love it, in fact I have a large one and a small one.