Suitable for Moosoo K12 K12 Pro K13 cordless vacuum cleaner. Made of high-quality material, it can block 99.97% of dirt, sawdust, dust, wood chips, pet dander and other particles as small as 0.3um, so it can reduce dust and other allergens in the air you breathe. As part of normal maintenance, it is easy to install, just disassemble the dust container, twist and remove the old filter to replace the new replacement filter. Washable and reusable K12 filter, it is recommended to replace the vacuum cleaner once every 2-3 months to maintain the best performance. Package Contents: 4 x filters.