Complete Decking Kit - Light Grey - Sanded BackOur Composite Decking Kits come with the boards, 3mm spacing fasteners and fixing screws required for the area selected. You can then selected the required number of L edging trims required to cover any exposed edges we do not include these in kits as the amount required can vary so dramatically. Composite decking boards are made by bonding a mix of plastic resin and wood fibres, to create a product that is far superior to traditional wooden decking.