Vacuum Cleaner Pre-Filter HEPA Filter Replacement For Dyson CY18 CY22 CY23 CY24 CY25 DY75 DY77 DY781. Compatible models: suitable for Dyson CY18CY22CY23CY24CY25DY75DY77DY78 vacuum cleaners 2. Made of preferred materials, durable and practical, easy to install, and can be easily disassembled and replaced3. Pre filter element, efficient filtration of fine dust, effective filtration of harmful microorganisms such as mites and bacteria, and protection of the host motor4. It can be cleaned and reused, it is recommended to wash with water once a month, thoroughly dry for 24 hours, and then reinstall5. It is recommended to replace it every 2-3 months, especially for households with pets. It is recommended to shorten the replacement time6. Size: about 10.45 x 11.6cm