Kood's Pre-Shaped Filter Set for Kood/Cokin A Holders allows you to create a variety of vignette borders. Each shape is cut of thick vinyl to protect edges from wear and tear. There are 5 different shapes in two different sizes giving you 10 different vignettes. Included shapes are circle, oval, keyhole, binocular and heart. Small apertures make the vignette appear smaller and sharper, while wide apertures give the opposite effect. Wide angle lenses also make the vignette appear smaller than if used on a telephoto lens. (only available in A size)