#1 grade southern yellow pine mail box post. Severe Weather Above Ground Copper Azole (CA-C) pressure treated lumber can be used in exterior above ground 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. Preservative pressure treated for long-term performance. Lifetime limited warranty that protects against damage by fungal decay or termite a