The 3 Landscape filters kit for Large 100mm size is composed of a GND8 (3 f.stops), Gradual Blue, Gradual Tobacco and a microfiber. Graduated Neutral Density (GND) Filters allow to reduce the amount of light reaching the sensor on a portion of your pictures so that you can reduce shutter speed and get some motion effect. By rotating the filter-holder you can place its effect, by sliding it up and down you can setup its intensity so that you can balance your exposure correctly. The Gradual Blue and Tobacco are famous to render unique atmosphere to your landscapes.