1.[COMPATIBILITY]- This replacement 6-blade is ONLY compatible with Ninja Professional Blender 72 Ounce Pitcher, including BL610, BL610BRN, BL610C, BL660, BL660A, BL660W, BL660WM, BL661BBYC, BL663, BL663CO, BL665QBK, BL665QCN, BL665QWH, BL710WM, BL710WMC, BL740, BL740C, CO610B, CO650B, CT610, CT610C, CT611C and BC701CCO. Please refer to image No.2 to check your original blade's base shape before placing . 2.[SAFE&QUALITY MATERIAL]- The 6 blade replacement for Ninja blender 72oz is made of food-grade stainless steel with corrosion resistance and BPA which is quite . The blade's excellent sharpness and 6-blade design can blend your food well without leaving bits and pieces of unblended bits. The great hardness also make it not easy to be damaged. 3.[SAVING MONEY]- Our 6-stacked blade assembly replacement for Ninja can replace your original dull or damaged blades to save you amount of money without buying another expensive blender. Your ninja blender will make a big difference with this 6-blade as its performance is as good as the original. 4.[EASY INSTALLAITON&WASH]- This 6-blade replacement parts for ninja blender is already assembled, you just need to install it to the pitcher torque which is very easy. For washing, you can put it in the dishwasher to your hands or brush it by holding its head. Please be careful when washing as the blades are quite sharp.