Our heavy duty slats provide mattress support and eliminate the need for a box spring. All of our platform beds and loft beds come with 13 bed support slats, which make the bed usable for any twin, full or queen mattress. These slats are 2 1/2″ wide and are spaced 3 1/2″ apart from one another. The slats are all connected to one another by two strips. All of our twin, full and queen bunk beds include a full slat kit of 26 slats (13 for the top bunk and 13 for the bottom bunk).