This Kitchen Aid Ultra Power Blender Replacement Base is for model number KSB5WH . Some of the ceramic has chipped off, but this area is hidden by the pitcher. THE COUPLING IS WORN AND MOST LIKELY NEEDS REPLACED.  The KitchenAid brand is well-known for its quality products, and this blender is no exception. Whether you're blending smoothies or making soups, this Kitchen Aid blender is up to the task.