The Square 43 diffuses the light with the flight in the drect flash position. The Light hits on the fabric diffuser and bounces back onto the highly reflective silver panels to generate a powerful light source. The light is then diffused and softened through the fabric diffuser to give your subject a richer tone and nicer shadow.
-1 Large Mount for SB-900, 580EX, 580EX II, or LP160 flash units.
-1 Square 43 Softbox
I reviewed this light recently. I absolutely love mine.
See the review here: