Our beds are designed with safety as our top priority. Solid, knot free, New Zealand pine wood construction; sturdy high 400-pound weight capacity per sleeping surface, with strong plywood slats. Our beds are equipped with solid pine, seven- 9 inches apart slats and metal support bars. We offer an upgraded slat roll that has fourteen slats -2.5 inches apart. We offer this for customers who use softer foam mattresses that may need the added surface area. If you are interested, you can certainly purchase these upgraded slat rolls here . For a detailed Fit & Measurements guide, please read here