AGPtek 20 Color Photographic Gels Lighting Filter for Canon/ Nikon/ Oloong/ Yongnuo FLash/ Speedlite (20 x Flash Gels, 1 x Attachment band, 1 x Storage pouch) AGPtek 20 Flash Gels - Combination Kits: AGPTEK Flash Combination Gel Kits offer you a choice of 20 dynamic colors and correction filters to help create dramatic and theatrical lighting in your images. Choose from a range of reds, yellows, blues, and greens to punch up an image with color and create mood. Or, use the correction gels to balance your flash to ambient light.