This is a Dynalite AR0040 Long Throw Reflector. It is used in situations where the subject is a long distance from the flash head, as in a theater or sports arena. The Long Throw Reflector confines the beam spread to 40¦ and intensifies the light for a longer, narrower throw than that of a "standard" 45¦ reflector.It is desined to fit the SH2000, SH4080 and AH4000 (4040, 4080 and 4080SP) flash heads (Former cat. #40-SP40)