Opteka SB-1 Mini Universal Studio Soft Box Flash Diffuser for The Nikon SB-900 SB-800 SB-700 SB-600 SB-400 SB-700 SB-900 SB-910 Flash Units Universal Studio Soft Box Flash Diffuser Provides soft even flash illumination One size fits all. Attaches with the included velcro strap and grip band Folds down flat for easy storage and portability Dimensions: 3.5" X 5"