Prime woods are those soft or hardwoods with high natural durability, good in general appearance, with an agreeable smell or odorless and high stability . Softer prime woods are used to manufacture exquisite furniture and for sophisticated finishing. Some of them are even used for windows and doors. Nevertheless, prime hard woods have the qualities above mentioned and a high resistance level. They are used not only to construct houses but also for engineering jobs that demand their unprecedented qualities. Those that stand out in this class are: ipê, cumaru, angico, jatobá, itaúba, tatajuba, pau roxo, maçaranduba and sucupira. There is a third class known as average woods. They do not have the high structural qualities of hardwoods, but still provide a good aspect and excellent natural durability. Therefore they are recommended for the making of doors, windows and other uses in which the structural aspect is not essential. Some of the most common are cedroarana, garapeira, angelim pedra, louro, catuaba and muiracatiara.