They fit all my rectangular flashes easily and I have several brands. The elastic attachment means they even fit round flashes, but I don't have anything to try. Adding one of these to the flash will soften the flash considerably. They come in handy when you're working in tight spaces, where you need to be mobile, or don't have room for a larger softbox. I even attached the gels to the outside of the diffuser with small pieces of tape.
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