Made of pleated HEPA filter, the cleaning efficiency is up to 99%, keeping your air fresh. Compatible with Neato D Series D75/80/85/945 and other furniture sweepers. The package includes 4 filters, motor life. Replace the Hepa to effectively protect the motor from inhaling small dust and extend the life of the motor. < p>Please clean the inner surface of the filter regularly to ensure optimal use of the filter.