1、Designed to fit for Philips AC4375, AC4373, AC4372 filter kit 2、It is composed of interlaced crude fibers, used to filter PM10 and other large particles, solid pollutants, animal hair, dandruff and so on. 3、New coatings are added to remove bacteria. Besides, harmful gases such as formaldehyde, benzene, and TVOC are removed by the oxidative decomposition. 4、Made with high quality material, sturdy and durable. 5、Perfect replacement for the old or broken one. Features: Designed to fit for Philips AC4375, AC4373, AC4372 filter kit It is composed of interlaced crude fibers, used to filter PM10 and other large particles, solid pollutants, animal hair, dandruff and so on. New coatings are added to remove bacteria. Besides, harmful gases such as formaldehyde, benzene, and TVOC are removed by the oxidative decomposition. Made with high quality material, sturdy and durable. Perfect replacement for the old or broken one. Specification: Condition: 100% Brand New Main Material: Cotton Color: As picture shown Package weight: Approx.476g Size(type a): Approx.37.3*29.4*1cm / 14.69*11.57*0.39in Size(type b): Approx.29.6*24*0.5cm / 11.65*9.45*0.2in Size(type c): Approx.37.9*29.8*3cm / 14.92*11.73*1.18in Package List: 1* Formaldehyde Filter 1* Activated Carbon Filter 1 * HEPA Filter