Metal [Sturdy Metal Frame] - This twin-size metal daybed with pop up trundle is manufactured with heavy-duty steel, strong bedstead and manufacturing experience can avoid noise, vibration and scratches. Powder coating finishes ensures durability and stability. [Space-saving Metal Frame] Sofa by day, bed at night, 2-in-1 design, this set is a perfect addition to the smaller Bedroom or condo with limited space. In addition to serving as single couch, on which you can watch TV or read a book to kill the time, the set is also great as guest beds, the trundle features braces which makes it easily rise to the height of a bed, also the trundle can be coupled to daybed by one T-notch design, making this set is very convenient for overnight guests.