Brand new, high-quality materials, well-made, durable, and highly compatible with the equipment. clean accessories keep your home robot at peak performance. Accessory contents are easily removed and replaced as part of routine maintenance. Also reduces the infiltration of dust, pollen and other allergens into the air you breathe. In order to achieve the best cleaning and filtering effect, cleaning accessories should be replaced every 2-3 months according to the frequency of use. Compatible with for Holmes UNITS: CAP531-U, CAP529-U, HAP240, HAP242, HAP412, HAP422, HAP424, HAP702, HAP706, HAP716, HAP1702, HAP2400, HAP9240, HAP9241, HAP9242, HAP9243, HAP9412, HAP9413, HAP9414, HAP9415, HAP9422, HAP9423, HAP9424, HAP9425 CARBON BOOSTER PRE-FILTER: Absorbs household odor from pets, cooking and smoking. And traps larger air contaminants like hair and lint Type:Purifier Accessories Colour:As Shown Material:Plastic Package Contents: 4 * filter 8 * filter cotton 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.