Opteka Inflatable Universal Studio Soft Box Flash Diffuser for Canon EOS, Nikon, Olympus, Pentax, Sony, Sigma, Other External Flash Units Provides soft, even flash illumination One size fits all. The flash mounting shoe features an adjustable elastic strap. Inflates and deflates in seconds. Color: Semi-Transparent (Front) & Black (Back) Dimensions: 220 x 150 x 10 mm (inflated) 220 x 150 x 110 mm (deflated)