The FXtra is a compact gel holder that facilitates a quick installation and removal of colored gels. Eight Rosco gels are included in the integrated storage pouch: CTO, 1⁄2 CTO, 1⁄4 CTO, Plus Green, 1⁄2 Plus Green, Sky Blue, Canary Yellow, and Fire Red. FXtra is sized to use with most popular flashes and the gel pocket accommodates the Strobist collection and both Rosco and Lee \ngel samples. Any LumiQuest accessory (and many other brands) can be attached while the FXtra is in place allowing you to colorize the light while using a variety of light modifiers. \n\nApplication: To colorize the light easily with or without other LumiQuest accessories in place.