Max twin/full bunk bed is a fun and functional sleeping space, capturing the look of steel building construction elements. Top twin size bed and lower full size bed are great for siblings, sleepovers, and story time. Bunk bed has heavy gauge metal tubing, full-length guardrails, and sturdy welded metal slat system for mattress support. Integrated ladder on both sides of the bed. Uses a standard twin size mattress and full size mattress (22222sold separately). Only use a twin size mattress that is 74-75″ long and 37.5-38.5″ wide on the upper bunk. Bunk bed is tested and certified by an independent testing laboratory to meet all minimum requirements of ASTM F1427-04 and U.S. CFR Title 16 Part 1513. The finish is a Silver frame with Red, Blue, and Yellow decorative panels, held in place with oversized Red acorn nuts. Some assembly required, keyhole slot construction. The color panels are interchangeable.