There are 2 main types of composite decking currently out in the marketplace. Wood Plastic Composite Decking (WPC), known as 1st generation and Capped Composite decking (Co-Extruded), also referred to as 2nd generation.  Both composite deckings can be bought with a solid or hollow profile in a wide range of colours and finishes. The most popular sinonwpc deck board is the deep embossed wood grain finish due to its incredible realism compared to natural wood grain boards.