Made of high-strength and environmental protection material,Easy to install. The clear out display can preserve the cleansing functionality of the sweeper and decrease the penetration of dust, pollen and other allergens into the air you breathe It is advised that will probably be changed each 1 -2months. Care Instructions: 1. Wash the ?lters continually using warm, soapy water 2. It is very important that the ?lters are completely dry (24 hours) For TY9879 , TY9890, TY9958, TY9990 and For RH9958WO , RH9959WO , RH9878WO , RH9879WO , RH9890WO Colour:As shown Material:plastic Package Contents: five x Filter Only the above package content, diverse products will not be included. Note: Light and varied exhibits can cause the colour of the item in the picture a piece various from the real thing. The length allowed error is +/- 1-3cm.