The DIY set includes eleven bent slats. The slatted frame, consisting of individual spring slats, you simply saw to the length you need. Then you attach the sawed spring slats in the slat holders. You then connect them to your bed construction with the included screws. The holes in which you insert the Froli springs are pre-drilled on the slats. Here you can vary and create your best sleeping experience. The more springs you use, the firmer your sleeping surface will be. So if you put 3 springs on the slat, you will sleep softer than with five springs on the slat. Put the mattress on top and your Froli bed is ready.