There are 20 gels to choose from, ten are color correction gels for balancing your flash with, for instance, sunshine or indoor lighting, while the other ten are color efect gels. Add them to boost your creativity and shape light in color. OCF Gels are pre-cut to fit Profoto Of-Camera Flashes, and mounted in the blink of an eye thanks to a unique and clever snap-on solution. OCF Gels are sold in three diferent kits. The OCF Color Gel Starter Kit includes the ten most popular gels plus the actual Grid&GelHolder. In addition, there is an OCF Color Correction Gel Pack and an OCF Color Efects Pack, each with 20 gels.