This is a Profoto Replacement 250Ws 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.
Kupo CS-40MK 40" Silver Master C-Stand Kit with Sliding Leg
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Kupo CS-40MKB 40" Black Sliding Leg C-Stand Kit with grip head and arm
Profoto Flashtube B1 



