The falcon eyes sbq-sb4545 softbox is 45 x 45 cm in size and is easy to assemble. the sbq-sb4545 is mounted on your studio flash unit with the included speed ring. the studio flash head sits deep in the softbox, which ensures minimal loss of light and provides an even spread of soft lighting. the sbq series softboxes are equipped with heat resistant material and 2 valves. when using continuous lighting, it is essential that you open the valves to ensure the heat emitted from the studio flash unit is released. Falcon eyes sbq-sb4545 softbox extra features The sbq-sb4545 is supplied with a standard falcon eyes speed ring. this speed ring is compatible with all falcon eyes studio flash units except for the falcon eyes ss series. By using an additional speed ring adapter, the sbq-sb4545 is compatible with bowens, broncolor, elichrom, hensel, multiblitz and linkstar studio flash units. further, by using the optional tmb-40fe strobist adapter, the sbq-sb4545 can also be used as a softbox for your speedlite. to view these speed ring adapter rings, please see the optional accessories tab below.