Earlier Sage Blanks - What Does "GFL" Mean?

Southsound

Steve Cole - Nisqually and Adjacent Environs
#1
I recently got a Sage RPL blank that has the following model designation on it:

GFL Graphite III 690-4 RPLB

I am curious as to the "GFL" acronym - the Sage repair person I spoke with thinks it just means the blank is a graphite fly blank but I am not sure that's entirely right. I have also heard that it stands for "Graphite Fiber Layup", but I dunno...

Anybody else have some notion of what the "GFL" might mean?

Thanks

Steve Cole
Tumh20