This is a lightly used Nikon R1C1 Wireless Close-up Speedlight Flash System with Commander SU-800 (Macro Kit A)
B&H prices this new at $730.
I am willing to sell this for $500
but wait, there is more...
I will throw in an additional SB-R200 for only $50 more (a $160 value) for a total of three flash heads plus commander and all of the fixings.
$550 gets you the whole shebang.
Shipping is free to the continental US.
Checks and Paypal(3%) accepted