The Shark RVFFK950 Replacement Pre-Motor Filters for AV751, AV752, And Other Vacuum Models are designed to efficiently trap dirt and debris before they reach the motor, enhancing the overall performance of your Shark vacuum cleaner. However, my experience with these filters was not so satisfying. While they fit perfectly into my Shark vacuum, they did not seem to work as effectively as the original filters that came with my vacuum. There was still dust and debris left behind after cleaning, which defeated the purpose of using these filters. On the bright side, they are made of high-quality materials and are easy to install. Also, if you're on a budget these filters are significantly less expensive than the original Shark filters, but still seem to do the job decently. Overall, I would say that the Shark RVFFK950 Replacement Pre-Motor Filters earned 3 stars out of 5. The filters are cheaper and still do a satisfactory job, but they're not as effective as the original Shark filters.