These high-quality & highly efficient soft boxes provide a nearly homogeneous window-light quality of illumination that is perfect for professional portraiture, fashion & product photography. They are made from lightweight materials which are also designed for high performance & to withstand years of use. Calumet Soft Boxes are easy to assemble & feature an all-white interior that was produced to provide the most efficient light possible. Their recessed front is designed to not only help control light falloff, but to accept grid accessory (sold separately) for additional light control. They also feature a removable outer-differ panel & inner baffle* for contrast control, durable rods, which come inserted into their slots for quick assembly** & a convenient carry case. All GENESIS Soft Boxes require a speed ring & dedicated flash-head adapter ring, which are sold separately, & are available from Calumet Photographic, along with the 40" Ribbon Grid Egg Crates for each model. * 22 Soft Box does not include an inner baffle. ** 72 Soft Box features two-stage rods which are not assembled.