Some brands, like Deckorators, offer two different types of composite deck boards. Wood-plastic composite is traditional composite material made of wood fibers and recycled plastic. Mineral-based composite (sometimes called MBC) is an enhanced version of PVC decking made from the highest-quality materials. Mineral-based composite boards have even less thermal expansion and contraction than PVC boards. They’re also typically thinner and lighter than composite boards, because at just 7/8 of an inch, an MBC board can deliver the same strength as a one-inch-thick composite board.