Specifications: Color: Black Material: Medium carbon steel, MDF, rubber Size of Sofa Bed: 78" x 40" x 31" (L x W x H) Size of Trundle: 70" x 39" (L x W) Sofa Bed's Height Above The Floor: 14" Trundle's Height Above The Floor: 3" Load Capacity of Sofa Bed: 550lbs Load Capacity of Trundle: 330lbs/ Suitable Twin Size of Mattress: 39" x 75"(L x W) Recommended Thickness: ≤ 8" Net Weight: 53lbs Key Features: ● To Meet More Needs: Thanks to 4 lockable rubber casters, the daybed trundle set offers 2 different using methods. When the trundle is put away, it becomes a cozy sofa with armrests as a whole. After you pull out and fix the trundle, it perfectly serves as 2 platform bed frames, further expanding the sleeping areas. ● Reinforced Steel Frame: The daybed with pullout trundle is made of medium carbon steel which features excellent sturdiness and rust resistance better than normal steel. Thus, sofa bed's load capacity is up to 550lbs and trundle's reaches 330lbs. Plus, sufficient steel slats are evenly and firmly located to eliminate annoying wobbling. ● Aim to Save More Space: Industrial panels bring a sense of modernity, so the daybed with trundle becomes a harmonious decoration in your home. Meanwhile, since the trundle can be completely hidden under the sofa bed, it's a very wise choice for small rooms to save space. In general, you can place it in the living room and bedroom. ● Gain Wider Sleeping Area: Both sofa bed and trundle can be categorized as platform bed frames, so there is no need for an additional box spring. Also, the sofa bed has a high headboard and a footboard. They can keep mattress in place without sliding, while the headboard allows you to lean on it to get a comfy position for reading. ● Worry-Free Installation: The package includes a detailed manual to guide you finish the assembly, which will simplify the entire process and save much time. For your information, a twin mattress measuring of 39" x 75" (L x W) is suitable and the recommended thickness is lower than 8".