The simple yet contemporary Manhattan twin-over-twin bunk bed is a modern classic, featuring a streamlined steel-crafted frame complimented by an eye-catching chrome finish. Quality tested sturdy steel construction features solid support and heavy-duty strength built in mattress slats. no box spring needed. 12.7''high safety guardrails of the top bunk prevent the child from falling. That will allow you to sleep safely and sleep tight over the night. Versatile Bunk bed can be separated into two twin beds depending on your needs .Weight Capacity:220 lbs for upper bed, 220 lbs for lower bed. Description: Product Dimension: 77.9"L x 41.3"W x 67.1"H Number of Package: 1 Weight Capacity(Upper/Bottom bed): 220LBS/220LBS Recommended Mattress Thickness(Upper/Bottom bed): 6"/8" Specifications: Product Type: Bunk Bed Size: Twin-Over-Twin Material: Metal Box Spring Required: No Number of Slats(Upper/Bottom bed): 15/15 Assembly Required: Yes Product Warranty: One year Notes: Manual measurement has been used,there may be some reasonable error. All the pictures are taken by actual samples, slight chromatic aberration may occur due to lighting or display.