Oak is strong and heavy, with a tight grain, great strength and hardness and is very resistant to insect and fungal attacks. Western Red Cedar is a soft red-brown timber. It is valued for its distinct appearance, aroma, and its high natural resistance to decay, being extensively used for outdoor construction in the form of posts, decking and siding. Englemann Spruce is very straight, light in color with a touch of red. It also has a specialised use in making acoustic guitars and harps. Douglas Fir is very strong with good fungal and mildew resistance. It is excellent for structural uses. Douglas-fir is also one of the most commonly marketed Christmas tree species in the United States!