5/4 X 6 X 12/0 MCA AG TREATED SELECT DECKING (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.