This is a cushion used under the mattress, which helps to alleviate the sagging of the mattress caused by the excessive gap between the support bars of the bed frame. It is suitable for general beds, sofa beds and metal bed frames. It is made of natural bamboo and nylon straps. Due to the toughness and strength of bamboo, it provides additional support to the mattress. It is made up of many bamboo strips arranged longitudinally, thereby enhancing the breathability of the mattress! It can be folded and rolled for convenient storage! Function：Engineered for king beds, Bunkie board provides extra support under the mattress to prevent the mattress from sagging due to the excessive distance between the bed board support bars，Suitable for sofa beds, metal frames, and ordinary bed frames where the spacing between the bed slats is too large. Note: If your bed frame only has vertical support beams, this model will not be used, this model is only suitable for bed frames with horizontal support beams. Material and Sizes: Made of natural bamboo strips connected with nylon straps，The bamboo pieces are 2cm wide，Board is 0.24 thick when flat . Weight: Approx. 34 pounds. Maximum load-bearing: 1000lbs，Bunkie Board overall size is 78 Lx 74.8 W. You can fold it and store it. The shipping package size : 40x 12.6 x 4.7 inches. Item Weight 35 pounds Manufacturer LOBOTOU Item model number ZDZ-001 Product Dimensions 78 x 74.8 x 0.24 inches