4X4-16' TREATED #2 S.YELLOW PINE PWMCA UC4A GROUND CONTACT (Actual size 3-1/2"x3-1/2"x192") | ProWood® professional grade GROUND CONTACT treated Southern Yellow Pine lumber for virtually any outdoor project. Pressure-treated Southern Yellow Pine lumber is perfect for decks, exposed structures, and other applications. Micronized copper azole (MCA) treated wood is more natural-looking and less corrosive to fasteners, and it looks good longer than many other outdoor preservative-treated products. Ground contact MCA treatment is ideal for where the wood may contact moisture, the ground or be installed in a manner that subjects the wood to comparable ground contact conditions.