The treated pine decking 90x22x5.4 is a board that is 90 millimeters wide, 22 millimeters thick, and 5.4 meters long. These specifications are essential to know when planning and designing a deck, as they determine the size and coverage of each individual board. This is a decking material made from pine that has undergone a treatment process to enhance its durability and resistance to decay, insects, and the elements. Pine is a softwood that is widely available and relatively inexpensive, making it a popular choice for decking, especially when treated to withstand outdoor conditions.