[Compatibility] This product contains 4 replacement HEPA filters suitable for plus 405 Combo / 505 Combo robot vacuum cleaner. [Quality] This product is made of high-quality materials that are and fine. They fit the devices perfectly and can be used with confidence. They capture 99.98% of particles as small as 0.3 microns. [Function] This product can filter dust and exhaust fumes, protect the vacuum motor, and prevent dust and other from entering the air you breathe. [Replacement Time] It is recommended to replace the replacement parts every 2 to 3 months, depending on how often you use your machine, to keep it running at performance. [Eco-Friendly Design] These filters are washable and reusable. They are easy to install. Simply take apart the dust cup, twist and take out the old filter and replace it with the one Color: Black Material: Polyester Package Contents: 4 x HEPA filters Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.