Mixed Species, heavy to (and often exclusively) softwoods. May include Douglas Fir, Alpine Fir, White Fir, Lodgepole Pine, Ponderosa Pine, others. The most common species used for NatureAged Timbers is Douglas Fir. Trestlewood can include hardwood timbers (RubyOak/RubyHardwood and other) at its discretion (see WeatheredBlend Hardwood Timber Spec Sheet #6160 and RubyOak/RubyHardwood Spec Sheet #s 6140 and 6147.)