These DIY Wood Stringers (full rough cut 1" X 4" X 96") are preserved with a waterborne, alkaline copper Quaternary preservative system developed to provide long-term protection of wood exposed in exterior applications. The preservation system is based on the well-established effectiveness of copper combined with an organic Quaternary compound and is applied to wood by pressure treatment. Treated wood products are available for above ground, ground contact and fresh water contact applications for projects such as decks, fences and landscaping.