NEEWER(TM) Softbox is designed to diffuse a strobe flash, giving you better even lighting. It comes with a silver reflective interior and a flush front face. It"s necessary in any professional portrait studio. Features: An internal & an external diffuser (both removable) for versatility in refining the hard/soft ratio of flash light Softbox is easily assembled using the softbox "skin", four flex rods and a speed ring for the flash head The softbox fits for the 300w 400W 600w 800W 1000w studio flash. Specifications: MODEL: SB-BW9090 Item size (cm): 90 × 90 Mount type: Bowens Shape: Rectangular(Square) Aluminum Ring Adaptor NOTE: The strobe head and light stand is not includedPackage Contents: 1 x 90cm x 90cm Softbox 1 x Inner diffuser 1 x Outer diffuser 1 x Bowens Mount Speedring 1 x Carrying bag