SMDV Diffuser SPEEDBOX-S50 - Professional 21 Inch (50cm) Rigid Quick Folding Hexagonal Softbox for Speedlite or Speedlight Flash - Legio Aerium Limited Edition Patented quick-release folding system for fast and convenient setup. Folds away in seconds! Light weight & Durable. Superior portability with the patented folding system Double diffusion panel for high quality soft light 21" (50cm) Diameter. 14" long when folded. Now with more durable steel rods.