2″ x 4″ S4S, Kiln Dried Appearance grade Alaskan yellow cedar Decking. Outperforms other lumber types including pressure treated for outdoor use, even buried in the ground. Appearance grade means small tight knots and a fair amount of clear, knot free wood. Smooth nominal dimension. Use as is for any outdoor use including decks, arbors, pergolas even in the dirt. Always check for available lengths.