[Perfect Compatibility]Perfectly compatible with your HSP001 smart air purifier. They work just the same as Part Number's filters. [Value Package]There are 2 types of filters totally replacement filters in the package: (Filter A 2 in 1) with one side: cold catalyst filter, and the other side: activated carbon filter. (Filter B 2 in 1) with one side: blue color pre-filter, and the other side: H13 grade ture HEPA filter. [H13 True HEPA Filter]In order to do the best for your air purifier,we only provide H13 grade HEPA filter which is to an efficiency of removing of airborne particles as small as 0.3 Micrometres .It is better than H11 filter [4 Stages of Filtration] The 4 sides filters make really high performance to help to remove both large and fine particles as small as 0.3 Micrometres, absorb more odors and smoke. and serve longer time with your machine Colour:Photo Color Material:composite material Package Contents: 2Sets x air purifier 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.