This is a Profoto Replacement 1000Ws Maximum Flashtube for the D1 Monolight.
Most current, professional flash heads and monolights are equipped with user replaceable flashtubes that may simply be plugged into, and unplugged from their sockets. With proper handling, these flashtubes may last for tens of thousands of flashes under normal use.
Profoto RFi speedring adapter Profoto
Savage Widetone SKY BLUE Background Paper 1.35m x 11m
Profoto Flash Tube D2 500/1000 Profoto 



