The Novatron Color and Diffusion Gel Filter Set, & Gaskets (8x8") includes one each of red, yellow, blue, and green gels. It also includes two sheets of diffusion material and two UV color correction filters. There is a pair of Gel Gaskets included as well. These are designed for holding gels in position for periods of time under intense heat. Gels and filters are 8 x 8" (20.32 x 20.32 cm).