This professional quality 40-Inchx 40-Inch softbox is manufactured from the very best materials. The internal rods are made from strong flexible carbon steel or duralumin, the fabrics are made from a specially treated polyester and are heat resistant up to 752 degrees. The high reflective silver base produces an even edge to edge distribution of light. Strong webbing holds the internal rods into place and two layers of high quality diffusion are on fluorescent. With both diffusers in place, a maximum light loss of only 1.2 f-stops is achieved. This soft box will fit a variety of different lights when used with the appropriate adapter ring. Interfit SSBR100 Square Softbox 40-Inch x 40-Inch adapter ring sold separately.