Contains 4 Hand Vac Replacement Only need to disassemble the old equipment and replace it with new equipment, the installation is Vacuum Filter for Handheld Vacuum HLVA315J, HLVA315J22, HLVA315J32, HLVA315J62, HLVA320J, HLVA320J00, HLVA320J22, HLVA320J26, HLVA320JS10, HLVA325BS21, HLVA325J10 For Black and Decker Replacement Filter VLPF10 and Black and Hand Vacuum Filter for Black and Decker Hand Vacuum Filter Part VLPF10 & N600601 washable & vacuum air filter Replace regularly helps improve the suction power of your vacuum, recommend to replace every 3 month