Assembly-style walking room for small animals. Cardboard walls with windows (set of 4). I purchased and assembled it once, but it has been stored at home without use. Please refer to image 5. I have taken it out of the bag and opened it, so please refrain from purchasing if you are sensitive to this. I will ship it in a size that fits the shipping dimensions, so there is a possibility of folding. Please understand this before purchasing. Immediate purchase is welcome!!