The "other" fiberglass?
My fav. of this type of rod material was Lamiglass' "S-Glass" blanks. (God I think i'm saying that wrong, but zip on correct name." Light walled, wonderfull in the hand and still use a few for "plug rods" and an old 9wt fly rod. My fav. rod for years (light drift rod made from a 10'6" S glass fly rod blank) was made from that material.
Still miss it.