Material: Flame-retardant polypropylene This material can be used in stores after closing. It's gray, so dirt is less noticeable and it's easy to use. Size: 3.50 x 1.70m *Up to 4 pieces can be bundled. Please let us know in the comments if you would like to purchase more. *The size notation is the actual measured value, but there may be errors from the actual size depending on the measurement method and the characteristics of the product.