It is product of large non-woven material, dust-proof and breathable, with pleasant filtering effect. Effectively filtering of dirt and allergic particles; Cleaning indoors stinky smell, like cigarette smoke and many others ; Keep indoor air fresh. A bag there are 12 goods of double-sided adhesive tape inside, which are used to stick on four corners of the clear out screen. colour:white material:Non-woven size:40x35cm Package Contents: 6*Air conditioning filter out Only the above kit content, other item are usually not included. Note: Light shooting and varied reveals may cause the colour of the object within the photograph slightly varied from the genuine thing. The size allowed error is +/- 1-3cm.