Frame Material : Metal [Durable and sturdy] Sturdy metal framework, and metal mattress platform in vertical slat open frame with decorative joint are crafted for strength and longevity. Classic lines and accenting provide a timeless look and lends unique character to the design of your bedroom. Each twin size bed supports maximum weight capacity of 300 lbs. [No box spring needed] The lift-up trundle provides convenient expansion of the sleep area, with its folding legs quickly engaging to bring the unit to full height while the casters allow for ease of storage. Thick and durable metal frame is built to last with a metal platform for reliable mattress support without the box spring [Easy assembly] All parts, tools and instructions are shipped straight to your door in one efficiently packed box for simple set-up that takes less than an hour with a friend’s help. Mattresses and bedding are NOT included [Standard Size] Daybed: 78.5“L x 41.5“W x 44“H; Trundle: 71.5“L x 41“W x 4-15.5“H (lift-up trundle bed with folding legs and casters); Trundle can fit up to 8 inches. [Peace of Mind Warranty] We offer a 1-year warranty guarantee, and if you have any issues with the product you purchased, please feel free to contact us