6 X 6 X 16/0 #2 MCA GC TREATED (FLS). Treated wood is used for long-term performance outdoors for decks, fences and landscaping. Micronized Copper Azole (MCA) is a copper-based wood preservative used in the pressure treatment of wood products for use in residential applications above ground, in-ground contact, or in freshwater contact. Micronized copper is coupled with micronized tebuconazole for long-term protection of wood exposed in exterior applications.