Southern Yellow Pine is a type of softwood commonly used in construction and woodworking. It is known for its strength, durability, and versatility. The provided context outlines various specifications for Southern Yellow Pine products, including kiln-dried (KD) surfaced lumber, rough lumber, and logs. The dimensions include thicknesses of 38mm and 50mm, widths ranging from 140mm to 300mm, and lengths of 14 ft and 16 ft. The lumber is graded for quality, with “Grade 3/4 sides clear” indicating a certain level of clarity and minimal defects on the visible sides.