The Formatt Hitech 165 x 200mm Resin Soft Edge Graduated Neutral Density 3-Filter Kit contains a range of soft-edge graduated neutral density resin filters. The ND Grad filters included are 0.3, 0.6, and 0.9 densities, offering exposure reduction of 1, 2, and 3 stops respectively. A graduated ND filter has density on half of the filter surface, helping to darken skies and other bright areas of the image. The filter is most dense at the edge and softly tapers to clear by the middle of the filter. The filters measure 6.5 x 7.9" / 165 x 200mm and are constructed from specially dyed CR-39 resin.