for :A10 Ultra;A10 UltraE;Dyad Pro Combo;Dyad air Combo; Made of high-quality materials, more Filter filters fine dust to reduce dust, pollen and other from penetrating into air you breathe. As part of normal maintenance, it can be easily removed and replaced It is best to replace spare parts every 1 to 3 months to keep machine running at its best performance Please note: the physical slightly color difference or difference, does not affect use, please do not mind, thank you! Color: As Shown Material: plastic Package Contents: 2 x HEPA Filter Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.