Suitable for the Moosoo K12 K12 Pro K13 cordless vacuum cleaner. Made of: It is made of high-quality material and can block 99.97% of dirt, sawdust, dust, wood chips, pet hair and other particles as small as 0.3 µm, so that dust and other allergens in the air you breathe can be reduced. As part of normal maintenance, it is easy to install. Simply disassemble the filter bowl. Remove dust, then rotate the old filter and remove it to replace it with the new replacement filter. Washable and reusable K12 filter. It is recommended to remove dust. Replace the vacuum cleaner every 2-3 months to maintain best performance. Package Contents: 4 x Filters. Your satisfaction is our goal! If you have any questions about using our products, please don't hesitate to ask. Contact us, we will give you a satisfactory answer.