This 4 in. x 4 in. x 8 ft. Pressure-Treated Pine Lumber features a micronized copper azole treatment to help protect the wood from termite infestation, rotting and fungal decay, making it ideal for outdoor applications. Use for a variety of applications including decks, stair support posts, walkways and other outdoor projects where lumber is exposed to the elements. When used properly, lumber is safe and environmentally friendly.