The 12-ft x 16-ft Trex Deck Kit includes 25 Trex Transcend® Tropicals 16-ft Grooved Composite Deck Boards; 4 Trex Transcend® Tropicals 16-ft Square Composite Deck Boards; 1 bucket (360-count) Trex Hideaway® Universal Hidden Fasteners and 16 Start Clips; 5 Trex 12-ft White Square Composite Fascia Deck Boards. The Trex Deck Kit is designed for and includes all Trex materials necessary for a 192-sq. Ft. deck build. The Trex Deck Kit does not have a substructure. Composite decks can be built on an existing substructure, or materials for one can be purchased separately. Additional non-Trex fasteners may be needed and must be purchased separately. Elevate your outdoor space with a complimentary cocktail rail to provide a flat surface for drinks, planters, and more. To build a cocktail rail, you will need two universal top/bottom rails, a Trex Transcend® infill kit, balusters, and a square Transcend deck board for each section of railing.