Selens Universal Flash Gels Lighting Filter SE-CG20-20 pcs Combination Kits for Canon Nikon Sony Godox Yongnuo Camera Flash Light Creat Magic Scene -- Colored Lighting Filters, or Gels, are Often Used as Accent Lights, or to Add Dramatic Color to Backgrounds or Selected Portions of a Scene for Artistic Effect. Change Color Balance of The Image -- Flash Gels Help to Improve the Color Balance of the Image. Includes 20 filters: 14 color effects, 5 color correction, 1 diffusion,1 Selens Gel-Band attachment. Filter size: flash head area, 2.5" x 2.5" (65mm x 64mm) Selens Warm Hint: The head perimeter of flash lamp should be more than 17.9cm(7.05 inch), otherwise the rubber gels-band would do not well fixed the flash color gels.