I went to Joanns and ask them what they are doing with the empty card board bolts and she answered oh we throw them out. So needless to say I got a lot of them free and cut them 10 1/2 inches so it would fit into my shelves. My hubby saw me doing that and he cut me the masonite board to size. Now I am in the process of winding my fabric up and store it into the shelves so I can see what I have.