Fins Blender Blade with Pre-installed Gasket: The 7-fin blender blade is made of food-grade stainless steel with a diameter of 10 cm, high hardness for qualified anti-corrosion properties. Enjoy the consistency and fresh taste of smoothies, fruit salads, or creamy soups. Applicable to: 7-piece replacement parts for BL2012/BL2013/BL480/BL480D/BL481/BL482 BL486CO/BL487/BL487A/BL488W/BL490/BL491 BL492/BL492W/BL640/BL641/BL642/BL642W BL642Z/BL680A/BL682/NN100A/NN101/NN102 models. Please confirm that your blender matches the above model before purchasing. Package contents: 1 x Ninja replacement blade. Rubber gaskets are pre-installed in the 7-fin bottom blades. You can use it with your blender, it's very simple, no additional action is required. The gaskets may come loose during transport. Please check and make sure to put it directly into the bottom replacement blade before use.