•Collapses down to a 1 ½ inch thick ring allowing for easy storage. •Utilizes patent pending sizing ribs that provide an equally tight fit to several sizes of flashes without the need for straps or bands.•Universal Fit - base mount opening is highly strechable (2"x3.25") fitting flash units as small as the SB600 up to SB900 Nikon, and 430exII to 580exII for the Canon. •The Inverted Dome is included with every Lightsphere Collapsible Purchase. •Works with your existing accessory domes - AmberDome, PowerGrid, and can be mounted right-side up or upside-down.