Prefect fit for HPA300 - Perfectly designed to fit HPA300 Filter R and Prefilter A, HRF-R3, HRF-R2, HRF-R1, HRF-. Easy to Install - No more measuring and cutting filters which is time-consuming, messy and potentially inaccurate. Now you can replace your old filter in a matter of seconds. These are specially cut and designed to for HPA300 Air Purifier. Premium Quality - Made from Premium Quality Activated Carbon to help keep your home smelling fresh and odor free. True HEPA filters manufactured by advanced filter technology, which capture 99.97% of airborne as small as 0.3 microns in size such as smoke, dust, pollen, pet dander and other . Advise to Expand the Filter Life - Take the filter out and then take a high power vacuum and vacuum the outside of the filter every 30 days,or to help clear up some of the dust on the outside of the filter and to also extend the overall of the filter. size: HEPA: 260x165x40mm HPA300: 440x360x5mm Material:Plastic + activated carbon colour:Black+white Package Contents: 3 * HEPA filter 8 * HPA300 filter cotton Only the above package content, other products are not included. Note: Light 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.