This bunk bed with trundle is made of heavy-duty metal, which has excellent durability and load-bearing capacity. This twin over twin bunk bed frame is designed with high guardrail and a bed frame with 2 built-in stairs.The high guardrail keeps you from falling off the bed while you sleep, and 2 built-in stairs are perfectly integrated with the bed. It is more stable than independent ladders and is not easy to shake or fall. This greatly reduces your risk of falling while climbing onto the bed. Our twin bunk beds with trundle take versatility to a new level, it also features a clever trundle underneath the bottom bunk for extra sleeping space. Ideal for space-saving use in compact areas, such as home apartments, company dorm rooms, etc.