Quality marine plywood from boardmaster available in different sizes, thickness and finishes marine ply | boardmaster javascript seems to be disabled in your browser.. Plywood boards. plywood boards are manufactured wood sheets made from thin sheets of wood veneer.ply sheets are generally glued together with adjacent sheets having their wood grain rotated up to 90 degrees relative to adjacent layers.. plywood boards sizes. we have a wide variety of plywood sizes and variations. just take a look at our selection below. further, our plywood prices are. China marine plywood manufacturers - select 2018 high quality marine plywood products in best price from certified chinese plywood for sale manufacturers, plywood wood suppliers, wholesalers and factory on made-in-china.com.