Advantage Gripware Apple Boxes are made in our own manufacturing facility in Roanoke, Alabama from imported Birch plywood. Sides are 3/4” thick 9 ply, and tops and bottoms are made with 1/2” thick 7 ply plywood. All boxes have a plywood center support.Boxes are glued and nailedWe highly recommend that all Apple Boxes be treated with a wood sealer to minimize warping. Due to EPA regulations, it would not be cost effectivefor us to do this at the factory.Also available:Apple Boxes“Set in One” Apple Box Set