HDStars On-Flash Disc Portable Softbox Large Diffuser 16" Diameter For Bower, Canon, Metz, Nikon, Nissin, Pentax, Sigma, Vivitar, Sony, Sunpack Flash Fits Most Shoe-Mounted Flash Units Flash Slides into Elastic Band on Base Measures 16" in Diameter Creates Round Catchlights. The softbox uses silver lining in order to more efficiently direct light.