These are High Quality Washable Reusable Dust Cup Filter. Includes 3 Filters in every pack. These filters are designed to fit EuroPro Shark Hand Vacuum Models: SV728NC, SV728N-1, SV736, SV738, SV738C, SV738CV, SV748, SV726N, SV728N, SV719, SV736R, SV736CR. Replaces Shark Euro-Pro Replacement Part Numbers: XSB726N, XSB-726N. Designed & Engineered By Crucial Vacuum. Absolutely Essential For Allergy Sufferers! It is highly recommended that you change your filters every 3 to 6 months for optimal performance of your Shark vacuum. This is a generic product designed and engineered in the United States by Crucial 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.