Sold as each 5 per bundle - 160 per pallet lighter than concrete. 25 percent thicker than competitor"s. Bigger, thicker, stronger and simply better. Unbreakable, no loss due to broken pads. Larger pads to increase spacing, by up to 12 percent saving time and material on pier sets, saves labor. Easily stackable for larger pad area and wider pier spacing. Triple stack for 4 square feet, 5 square feet and 6 square feet to maximize pier spacing.