[Compatibility] This product contains 4 replacement HEPA filters suitable for iROBOT Roomba plus 405 Combo / 505 Combo robot vacuum cleaner. [Quality] This product is made of high-quality materials that are durable 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 allergens 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 peak 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