The top is made from 1/2" OSB and covered with indoor / outdoor carpet * Glued and stapled so it will stay securely fastened * The under frame box has 2 cross braces, and is made from 2x2"s both glued and nailed for strength * 4" tubes sit just off the ground so no more lifting the boards to find your washers * Our 3 Hole board set measures regulation 12"x32"