I have 2 of them one extra LRG made from 2 plastic cardboard
sheets 4'X 6' 6" edged on backside with 1"x 2" trim and hinged together, both sheets are covered with a very thick white flannel.It opens up to be 8' x 6' 6" My small one is 32" x 36" plastic cardboard covered with thick white flannel WORKS GREAT