Tuna Blanks - what really are they?

edited February 2014 in Rods
What makes a tuna blank? How different is a tuna blank from other saltwater blanks? Are they more parabolic than bottom blanks? Anyone can help put down the characteristics of a tuna blank?

I enjoy experimenting with stuff and thinking of picking up a tuna blank. Will be thankful if some kind soul can shed some light. ;)
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