Glass bottle. This Grade A Dark Robust (formerly Grade B) syrup is blended from sap harvested toward the latter part of maple season. It is dark in color and has a deep robust maple flavor. Many folks use Dark Robust for table syrup, baking and the Master Cleanse. Harvested toward the latter part of maple season, this Grade A Dark Maple Syrup (formerly Grade B) is dark in color and has a deep robust maple flavor. Many folks choose our Dark syrup for baking and the Master Cleanse. Farmers of the Maple Valley Cooperative work together using traditional methods to extract the clear, sugary substance, drip by drip. Wisconsin maple sap contains two to three percent sugar, straight out of the tree. Nothing is added. No colorings, no preservatives, no corn syrup or artificial flavorings. It’s just good, delicious maple syrup. Antioxidants Vital minerals Gluten-free No GMOs used Certified Kosher Vegan Keep refrigerated after opening.