Made of high-strength and environmental protection material,Easy to install. The filter screen can keep the cleaning per compatiblemance of the sweeper and reduce the penetration of dust, pollen and other allergens into the air you breathe It is suggested that it should be replaced every 1 -2months. Care Instructions: 1. Wash the filters regularly using warm, soapy water 2. It is very important that the filters are completely dry be compatiblee (24 hours) compatible TEFAL TY9879 , TY9890, TY9958, TY9990 and compatible ROWENTA RH9958WO , RH9959WO , RH9878WO , RH9879WO , RH9890WO : Material:plastic Package Contents: 10 x hepa 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.