LXJ SMILE Two-Sides Flash Diffuser Softbox Silver/White Reflector For Canon Nikon Pentax Yongnuo Godox Sony Sigma Speedlite +12pc Strobist Flash Color Lighting Gel Pop up Filter For soft indirect flash light use the pure white size. For greater range and spectral highlights use the silver size. It helps to reduce hard background shadows and eliminates the annoying red eye effect. 12pcs Strobist Flash Color card diffuser: Applications are almost endless with these gel colors, from cool effects that you can do for backgrounds, for enhancing skintone in portraits, color correcting or matching ambient, simulating different kinds of light, special effects, cheating white balance and a whole lot more.