This is a Dynalite Umbrella - White with Black Backing - (40"/1.0 m). It softens and broadens the light from the strobe source. The black backing prevents loss of light and provides maximum output from your source. The backing is removable so you can use the umbrella like a soft box by shooting through the white inner material. This umbrella employs a unique folding design which allows it to break down to a compact 20" for packing.