Common dimensions: 4-in x 4-in x 10-ft; actual dimensions: 3.5-in x 3.5-in x 10-ft. #2 Grade southern yellow pine. Severe Weather Ground Contact pressure treated exterior wood protected with Copper Azole (CA-C) provides lasting support and protection for all-purpose applications. Suitable for burial or contact with the ground and fresh water immersion applications. Ground Contact treatments are not suitable for direct contact with aluminum or un-coated metal products. For optimal performance of paint and stain coatings, allow the wood to dry after installation, and apply a UV protective finish to enhance the long-term beauty. Use building code approved fasteners and hardware: Hot-dipped galvanized or stainless-steel is recommended. Ideal choice for decks, gazebos and all exterior projects.