1、Made of high-quality materials, durable, wear-resistant, corrosion-resistant. 2、Using cotton filter, 99.97% of allergens and pollution can be captured from the air to improve air quality. 3、The installation method is simple, and the old or damaged parts can be replaced directly to improve the working efficiency of the air purifier. 4、It helps to remove dust from the home and prolong the service life of the air purifier. 5、This filter is perfectly fit for Holmes AER1 total air HAPF30AT-U4R. Features: Made of high-quality materials, durable, wear-resistant, corrosion-resistant. Using cotton filter, 99.97% of allergens and pollution can be captured from the air to improve air quality. The installation method is simple, and the old or damaged parts can be replaced directly to improve the working efficiency of the air purifier. It helps to remove dust from the home and prolong the service life of the air purifier. This filter is perfectly fit for Holmes AER1 total air HAPF30AT-U4R. Specification: Condition: 100% Brand New Item Type: Air Purifier Filter Material: ABS, Cotton Fitment: Fit for Holmes Holmes AER1 total air HAPF30AT-U4R Fit for CAP531-U, CAP529-U, HAP240, HAP242, HAP412, HAP422, HAP424, HAP706, HAP716, HAP9240, HAP9242, HAP9412, HAP9422, HAP9424 Weight: Approx. 125g / 4.4oz Size: Approx. 25.5x12.7x3.7cm / 10.0x5.0x1.5in Package List: 1 x Air Purifier Filter Note: 1.Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.