The Blendtec 40-609-61 FOURSIDE-S blender jar can hold 2 quarts or 75 ounces at most, but on the outside of the jar, markings up to 32 ounces help you easily measure out ingredients. The square shape of the jar creates more friction when blending, making your mixtures smoother. The 3-inch, tuned wingtip blade is thicker and stronger than other blades. The black and clear jar are made of BPA-free co-polyester that resists breaking. The Blendtec 40-609-61 FOURSIDE-S blender jar is compatible with all Blendtec blenders and should only be used in a sound enclosure.