Model 89000MTL-AB-KD-UBunk Bed Size:Twin Over Twin - Mattress Support:Built In - Bed Dimensions:42"L X 78.5"W X 60"H - Sturdy welded tubular steel construction - Powder coating that is virtually chip proof using all lead-free non-toxic paint - Meets all ASTM and CPSC standards - 150 LBS Weight Limit - Use mattresses which are 74"-75" long and 37.5" - 38.5" wide and that do not exceed 8.5" thick including the mattress surface and foundation combined - Mattresses not included