Does anyone know what blanks were used for the original Penn Tuna sticks (the black ones, not the white ones)?

The shorter (5'6") 30 - 50 rods are the blanks I'm trying to figure out.

I have a set of them, with 30 Internationals - and they are perfect for 90% of the fishing I do. I would love to build a set of rods using a similar blank...

Thanks