· Designed by a working photographer, Strobo-Socks can be used with virtually every battery powered flash unit. The Elastic opening fits easily over the 5" round reflectors of systems like Quantum, Sunpak, Lumedyne or Norman. · For smaller shoe mount flashes, Strobo-Socks becomes a versatile diffuser able to soften the direct flash or create a bare bulb effect. · Strobo-Socks are a lighter, more easily stowed and more compact flash diffuser solution than the hard plastic box type variety. Strobo-Socks can also be used to replace fill flaps. They are not intended for use with flash units that have continuously burning modeling lamps.