This is a pair of adjustable side flags for the Vocas 350 4x4 rod mounted mattbox.

Side flags give you more control over light spill from your lighting setups or from natural spill. Great in exreme lighting to reduce or control light spill from the sides - we have also used these in extreme weather and have occaisionally used velcro to attach the front parts of rain covers onto larger cameras. 

You may also want the extra wide top flag which can work in conjunction with the side flags.