Bed Material: Pine wood+MDF Size: Twin Numbers of Package: 1 Assembly Required: Yes Overall Product Dimension: 77.4''L*41.7''W*70.9''H Package Dimension: Please refer to the Specification Bed Dimension: 75.4''x 38.6'' (inner size) Total Height: 70.9'' Number of Upper Bed Slats: 14pcs Overall Product Weight: 97lb Upper Bed Weight Capability: 250lb Recommend Upper Bed Mattress Thickness: 6'' Recommend Down Bed Mattress Thickness: 8-10''