These clip in gels are part of the Interfit Strobies Modilite system. The color diffuser supplied enables multiple light patterns to your background. The transparent diffuser also makes an excellent neutral light source. The tungsten diffuser allows you to work with a tungsten light source and flash at the same time or as a creative light source at 3200k. color diffuser colors included: Red, Transparent, tungsten, blue, yellow. This set of filters are designed to work with the Interfit Strobies Uni-Mount (Sold Separately).