We don't claim these are original NutriBullet. It is only used to prove the compatibility of accessories. Please check whether the gear of the bottom loosen or tighten before use. If it's loosen, please tighten it Please check the rubber gasket and be sure it is put snugly into the bottom blade. (The rubber gasket is used to avoiding leakage） 3.Please make sure the blade in right place and locked tightly, replace the gasket if the blender begin leakage. 4. Do not run your blender over 4 minutes at a time to prevent overheating of the blender. 5. Please check your blender regularly and the blade needs to be replaced if there is leakage or loud noise. 6. The extractor blades are recommended to replace every 6 months or as needed for optimal performance.