Board Size: 135mm x 25mm x 3600mm Whiteriver Composite Decking is manufactured using a wood and HDPE mix, creating a revolutionary composite of improved, user-friendly material that out performs other traditional pure wooden and plastic materials. With no need to be stained or sealed, you save time and money now and in the future. It comes with a hollow construction and with the option of a reversible smooth or grooved surface. Our most popular design is available in four colours and comes with matching railings and accessories.