Compatible with Moosoo K12 K12 Pro K13 cordless vacuum cleaners. Made of premium materials, it blocks 99.97% of dirt, sawdust, dust, wood chips, pet dander, and other particles as small as 0.3um, helping to reduce dust and other allergens in the air you breathe. It installs easily as part of normal maintenance, simply remove the dust container and twist and remove the old filter to replace it with the new replacement filter. Washable and reusable K12 filter, it is recommended to replace the vacuum cleaner every 2-3 months to maintain optimal performance. Package Contents: 4 white filters. 4*4.8 cm.