AC2® select pressure treated decking is the highest quality of treated decking. Its surface area has the smallest and least amount of knots of any natural wood decking. 95% of the decking is knot free with only dime-sized knots allowed. AC2® brand treated wood products use MicroPro™ technology, which is a revolutionary way to pressure treat wood for decks, fences, landscaping, and general construction uses. MicroPro™ technology offers many benefits including significantly improved corrosion performance, lighter more natural color, and it is environmentally friendly. Wood is a natural product with many unique characteristics and properties. While wood's strength and workability make it highly suited for general construction and building projects, other inherent characteristics make it subject to checks or splits and warp or twist. In addition, the actual size is almost always smaller than the nominal (common name) size and the actual size may vary slightly depending on the moisture content.