Don’t knock the classics—these wood boards are a strong and affordable building material. Made of spruce, pine, or fir (SPF) softwood, they’re less dense and easier to drill and saw than hardwood, but still sturdy enough to make into crates and other load-bearing structures. The wood is premium grade—it’s cut from deeper inside the tree than standard grade wood—so these boards are straight and free of defects. Any knots are tight and spaced apart, making the boards easy to work with.