LEE Filters 4x4" Neutral Density (ND) 0.6 Resin Filter 6NDSTD
Amazon.com : Lee Filters 4x6 (100x150mm) Neutral Denisty soft edge grad set includes 0.3, 0.6 and 0.9 soft edge grad filters and triple filter wrap : Camera Lens Neutral Density Filters : Electronics
LEE Filters 100 x 150mm Soft Graduated Neutral Density 0.6
LEE100 0.6 ND Grad Very Hard - LEE Filters Direct USA