Douglas fir is low maintenance, resistant to decay and insects, and easy to paint and stain. Douglas fir is a sound choice for all types of building projects. Product Specs: Species: Douglas Fir. Size (Nominal): 3" T x 6" W x 8', 10', 12' L - (Actual) 2 1/2" T x 5 1/2" W. Wood Grade: #1 & Better. Cut: S4S, Rough (Sandblast Finish available