Compatible Model: This product is fully compatible with Shark Clean Lightweight Cordless Cleaner models including BU3523, BU3521, BU3120. Please confirm that your machine model matches one of our compatible products before purchasing Pack Includes: Our pack includes 3 Handheld Vacuum Pre-Motor Filters, 3 Auto-Empty System Pre-Motor Filter Assemblies ( 3 Foam filters and 3 Felt filters), 3 Auto-Empty System HEPA Filters and 1 Cleaning Brush, thess can keep your home clean and comfortable. Compare to Part XPRFIW1000, XFBU3000. These accessories improve dust filtration, control odors, and maintain optimal performance Premium Material: Made of high-quality materials, this filter is built to last. Can capture over 99.97% of dander, dust, and hair with filtration. Covering tiny particles down to 0.3 microns. Creat a healthy and comfortable environment breathe fresh air and clean floor, meet the demand of your daily life Washable And Reusable: Maximize cost-efficiency by rinsing our filters thoroughly with clean water, allowing them to dry thoroughly, and reusing them. For peak performance, we recommend replacing the filter set every 2-3 months to help extend the lifespan of your vacuum cleaner Easy Installation: When it needs to be replaced, just remove and replace it from your machine equipment, no tools are required BU3521 BU3120 HEPA Filter Replacement for: Shark BU3523 BU3120 BU3521 Clean Lightweight Cordless Stick Cleaner, Shark BU3523 Clean and Empty Cordless Stick Vacuum and Auto Empty System