As part of the bargain, the user does have to do some assembly, as demonstrated on the The DIY Lighting Kits site. But it seems simple enough. And once it's finished, you can use it on a variety of flashes including the Nikon SB28, SB80dx, SB800, SB26 and Canon 430EX, 580EXII.
If you've ever wanted to experiment with ring flash, this might be the ticket for you.
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