[SIZE]Air Purifiers replacement filter element(2 x 2 x three inch). [FILTER COMPOSITION]pre-filter layer, HEPA filter out layer and activated carbon filter out layer. [FUNCTION]This clear out helps to purify pollen, smoke, domestic dog dander and PM2 Micrometre pollution in the air. [REPLACEMENT CYCLE]It is usually recommended to switch the purifier filter aspects each 3-6 months. The service life of the filter out depends on the operating time and current air conditions. colour:White Material:plastic Package Contents: 1 x Air Purifiers Filter Only the above package content, diversified merchandise are not included. Note: Light capturing and various displays may cause the color of the thing in the picture slightly varied from the real thing. The dimension allowed error is +/- 1-3cm.