Use Honl Color Correction filters to color correct your strobes for tungsten, fluorescent or cool daylight lighting environments. Use CTO filters to match your flash output to tungsten lights, or simply to give a pleasing warm tone to your portraits. Use Full + Green to match your flash output to fluorescent lights. These superior filters are pre-cut with velcro strips attached so they can be quickly fastened to a Speed Strap (sold separately). Honl Filters can be used in conjunction with Honl Snoots, Gobos and Grids. The usable filter area is 2.5" x 4" and can be trimmed to fit individual strobes.