Which construction?

[burchas]

I see Soller offers biaxial tapes, although 4" is their broadest size. Biaxial would make for very stiff rails.

Would be helpful if they had it in 6". Their prices are really cheaper by far.
I wonder if there is any difference in quality of materials.

Can't remember where I read about it, saying something to the fact that the Aerospace grade carbon is
far superior to the industry standard. Not sure if that's a myth or an actual fact. Would be helpful once
I'm done with budget prototype boards.