Total length: approximately 90cm Number of holes: 4 The material of the back side is unknown. There is some dirt near the center of the back, but no cracks are visible. I think it can still be used. Please understand that this is a used item. I will ship it rolled up small. If you have any concerns or questions, please comment before purchasing. Cancellations, returns, and claims after purchase are not accepted. I plan to ship via Yu-Packet Post, which uses recycled materials and offers tracking and anonymous delivery. 0408-A0218-251123