Nispira premium True HEPA with Preliminary filter replacement compatible with Miko air purifier model C102 and Model MA-18 Preliminary filter traps large particles such as hair, dust. True-HEPA captures up to 99.97% of particles, as small as 0.3 microns. 4 pack included. Suggest to replace filter every 6 months to optimize performance. Quality meets or exceeds leading national brand. Easy to install. Dimension 6.75 x 6.75 x 5.4". This is not an OEM product. Any use of the name Miko or model designation for this product is made solely for purposes of demonstrating compatibility.