1.[NOTE]Please confirm first that your Ninja Blender meets these three necessary conditions: 1,Your ninja blender blade is 7 fin blade(not 6 fin); 2,The bottom diameter of original blender blade is 4 inches; 3,Your ninja blender cups is 18oz/24oz/32oz. Not 16oz. 2.[Compatible With]This replacement blade only compatible with Ninja Foodi Power Blender BL456-30, BL451-30, BL454-30 Nutri Ninja Auto-iQ BN751, BN800, BN801, BL481-30, BL482-30, BL490-30, BL681A-30, BL682-30, BL642W, BL682, BL680A-30, BL681A, BL681C,BL682-30, BL682QT-30, BL685-30, BL687CO-30, CT680SS, CT680CO2SS, CT641-30, Nutri Ninja Auto-iQ Pro Complete BL487-30, BL488W-30, BL487A-30, BL486CO-30 Nutri Ninja Auto-iQ Compact System BL491-30, BL492-30, BL492W-30. 3.[]7 Fins, 4inch'/10cm diameter, Made of high quality BPA-Free high impact plastic and food-grade high-strength stainless steel, dishwasher . Precision long-lasting and work great. Easy installation and cleaning, perfectly match of original parts. 4.[No More Cracks and Rust]Replacement blades in market are easy to crack and leak after several times use, we released this version to overcome those issues for customers after a long period of research and testing in the design and production process. 7 fins ninja blade greatly enhances the durability of our blender blade and eliminates rusting.