This ssa-sb4545 from falcon eyes is a softbox developed for studio flash units with a 9.5 cm diameter, such as flash units from the falcon eyes ss series and linkstar mt series. the softbox is easy to assemble and with the help of the holder, with four clamping screws, can be placed on the flash unit. as a result, the flash head sits deep in the softbox and little light is lost. the softbox provides a nice, soft illumination. With which studio flash units can i use this softbox? The ssa-sb4545 is compatible with all studio flash units with an outer diameter of 9.5 cm. for example the falcon eyes ss-200d or linkstar mt-250d (see optional accessories).