Features:* .* Made of high-quality material, and practical to use.* The filter can maintain the cleaning performance of your vacuum cleaner while reducing the penetration of dust, pollen and other allergens into the air you breathe.* The filter captures dust and allergic particles during the cleaning process, very suitable for asthma patients, allergy patients or pet families.* Under normal maintenance, it can be easily removed and replaced.* It is recommended to replace it every 2-3 months or depending on usage to keep the machine running at peak performance. Technical data:* Mounting:For Karcher6.904-068K 2000 EK 2000 TEK 3500 EK 3501NT 14/1 classicNT 14/1 EcoNT 14/1 Eco AdvancedNT 14/1 Eco Te AdvancedTo operate Festool:452 065CT 11 ECT 22 ECT 33 E/LECT 44 E/LECT 55 EAcut coil cutters 11 EAcutt coil cutters 22 ECTL 33 E/LECTL 44 E/LEcut coil markers 55 E.�.rect.e. Registration of the Community trade mark 11 E.�.r.m. 22 ECTM 33 E/LECTM 44 E/ LERestration of Community trade mark 55 E* Colour: as pictures showPackage contents:2 * filtersNote:1. The actual colors of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.