BEFORE PURCHASING please check your Old Blade to make the following:1. Count the FINS IT SHOULD BE 6-FINS.2.The blade has FEMALE FINS 3. 4 inch (10cm) Diameter[Attention]This is 4inch 6fin female blade.Take out a credit card and compare it with your machine as shown in the figure. If the length of the credit card is almost the same as the diameter of the machine, please buy 3.35inch blade instead of the 4inch bladeNo Suitable for Not for 16oz cups or 3.35 inch blade such as these model: BL660, BL663, BL740, BL770,BL771,BL773CO,BL780,BL780,Bl810,BL820,BL830.Not for Ninja series such as ss101,ss351,ss300, ss151 etc.No Suitable for NOT for 7 fins blade .Not for Nutri Ninja Auto iQ NN100, NN100A,NN101,NN102,BL2012,BL2013,BL450-30,BL455-30,BL481-30,BL482-30,BL485,BL486CO,BL487,BL487A,BL487T,BL491,BL492,BL492IS-30,BL494,BL640-30,BL641-30,BL642-30,BL680A-30,BL681A,BL681C,BL682-30,BL682QT-30,BL685-30,BL687CO-30,CT680SS,CT680CO2SS,CT641-30 (Please confirm your blender need 6 fins replacement blade before purchasing).Updated Blade Style This latest replacement ninja blender blade overcome the Crack&Leaks&Rust issues for customers after a long period of research and testing in the design and production process.BPA free and Dishwasher safe.Material: plastic + stainless steelColor as shownPackage Contents:1 x Blender Blade2 x Extra gasket for bladeOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.