**NOTE: This item requires an S-Blade Assembly to work properly. S-Blade Assemblies have the letter "S" imprinted onto the metal portion of the blade. (see photo #3 above). All Tribest Personal Blenders ordered after July 17, 2006 will have S-Blades already installed.** Now you can blend, serve and store your favorite blended recipes in the same glass container with the Tribest Personal Blender Mason Jar Adapter. The Personal Blender Mason Jar Adapter allows you to use glass mason jars as the blending containers with the Tribest Personal Blender. Simply use the mason jar adapter to connect your mason jar to the blade assembly, and you're ready to go. Mason jars allow for sealed storage and neat, easy stacking, taking up less room on your refrigerator shelves. Use the mason jars to blend and store baby food, smoothies, soups, and sauces. You can also use them to grind nuts, spices, coffee beans, and much more. You can choose your favorite size, so there's no waste! If you have leftovers, you can store your recipes right in the glass jars.