This CTB 5-Piece Gel Set with Bag for Inca 12 Fresnel slip into the Inca's gel holder. The 4 CTB filters cool the tungsten balanced Inca in 1/8, 1/4 and 1/2 increments until finally converting the output to approximately 5,600K daylight balance with the Full CTO filter. A diffusion filter is included to soften shadows. The gels store in the included fabric bag with handle.