Made of high-strength and environmental protection material,Easy to install. The filter screen can keep the cleaning performance of the and reduce the penetration of dust, pollen and other into the air you breathe It is suggested that it should be replaced every 1 -2months. Care Instructions: 1. Wash the lters regularly using warm, soapy water 2. It is very important that the lters are completely dry before (24 hours) For TY9879 , TY9890, TY9958, TY9990 and For RH9958WO , RH9959WO , RH9878WO , RH9879WO , RH9890WO Colour:As shown Material:plastic Package Contents: 3 x Filter Only the above package content, other products are not included. Note: Light reflection 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.