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KIND REMINDER BEFORE PURCHASE: Fit for the following Nutri Ninja blenders: ONLY FIT Ninja Ultima Blender BL810/BL820/BL830 FIT Ninja Blender QB3000SS, Nutri Ninja 2-in-1 Blender & Food Processor QB3000/QB3004/QB3005 ONLY FIT Ninja Professional Blender BL660/BL663/BL663CO/BL740 ONLY FIT Ninja Mega Kitchen System BL770/BL771/BL772/BL773CO and Ninja Supra Kitchen System BL780/BL780CO TIPS FOR USAGE 1. You are recommended to replace your ninja blender replacement parts every 6 months or as needed for optimal performance 2. Please check whether the gear of the bottom loosen or tighten before use. If it's loosen, please tighten it 3. Please check the rubber gasket and be sure it is put snugly into the bottom blade. (The rubber gasket is used to avoiding leakage) 4. Do not overfill the "MAX" line to avoid spilling, do not add ingredients past the "Max" line 5. Place the replacement blade onto the cup and screw it tightly until you have a good seal 6. Do not run your blender over 4 minutes at a time to prevent overheating of the blender 100% SATISFACTION GUARANTEE