The ferns is to be used as the central piece of your deck, where your slats will end.
The deck framings meanwhile, is to realize your peripheral frames.
Wether you nedd a fern or a deck framings, this is the same plank format you will find.Smooth 4 sides (S4S) deck ferns and framings. Available in several sections 6 to 20 mm thick, 60 to 240 mm wide and 1 m 40 to 4 m 45 long