Size:2 Foam & Felt Kits Filter Fits Rocket HV300 and HV310 Series. Compare to Part XFFV300 & 1080FTV320. It is washable, reusable. We suggest you change your filters every 3 to 6 months for optimal performance of your Shark vacuum. This is not a Shark® OEM product and is not covered under any Shark® manufacturer's warranty. The Shark® brand names and logos are the registered trademarks of their respective owners. Any use of the Shark® brand name or model designation for this product is made solely for purposes of demonstrating compatibility.