The Litepanels Inca 6" LED Fresnel 5-Piece CTB Gel Filter Set is comprised of one each Full, 1/2, 1/4, 1/8 CTB, and one Opal Frost Diffusion filter. The blue filters are used to cool the Inca's tungsten-balanced output to match daylight shooting situations or other daylight-balanced fixtures. The filters store in the included fabric bag.