【Metal】
【Dimensions】Overall Product Dimension: 77.1''L*40.9''W*53.7''H. Mattress not included. Some assembly is required, although we have provided clear instructions and tools. 
【Solid Construction】Bunk bed twin over twin is made of high quality heavy duty steel for optimum strength and durability, and without any chemical smell, it is the first choice for healthy living. Evenly spaced, solid metal slats blend naturally into the already sturdy platform bed frame to give added ground-up support that provides extra stability and prevents mattress sagging. Weight Capacity:Upper bed: 250 LBS Bottom bed: 350 LBS
【Noise Reduced】With an anti-noise design, slat locks are added between the slats,we have significantly reduced squeak noise that steel beds have in common. You will have a good and quiet sleep from now on.
【Designed for child safety】Thoughtfully constructed, the metal bunk bed twin over twin includes the ladder and upper full-length guardrails for enhanced safety so that allows you sleep tight and safely over the night. 
【Modern Twin Over Twin Bunk Bed】This metal bunk bed frame has a very modern silver finish, it can easily blend in with bedrooms,apartments of different decoration. There is a rubber pad at the end of each post to avoid the scratch to your floor.